Equity Compensation (Tables)
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6 Months Ended |
Jun. 30, 2016 |
| Equity Compensation |
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| Summary of stock option activity |
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Weighted
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Weighted
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Average
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Shares Subject
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Average
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Weighted
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Remaining
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to Options
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Grant Date
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Average
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Contractual
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Outstanding
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Fair Value
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Exercise Price
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Life (Years)
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Balance at December 31, 2015
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4,572,672
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$
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10.72
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Granted
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50,000
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4.63
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8.16
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Exercised
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(163,071)
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4.36
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Expired
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(49,001)
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13.38
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Forfeited
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(42,701)
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16.02
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Balance at June 30, 2016
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4,367,899
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10.85
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Exercisable options at June 30, 2016
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3,317,629
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9.54
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5.2
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Vested and expected to vest at June 30, 2016
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3,316,345
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10.79
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5.8
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| Summary of stock options outstanding and exercisable |
The following table summarizes information about stock options outstanding and exercisable at June 30, 2016:
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Options Outstanding
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Options Exercisable
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Weighted-
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Weighted-
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Weighted
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Average
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Average
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Average
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Number of
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Remaining
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Number of
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Remaining
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Exercise
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Underlying
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Contractual
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Underlying
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Contractual
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Range of Exercise Prices
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Price
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Shares
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Life (in years)
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Shares
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Life (in years)
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$
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2.34
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-
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3.59
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2.78
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206,448
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0.6
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206,448
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0.6
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$
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4.78
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-
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7.28
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5.90
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1,499,698
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4.3
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1,477,314
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4.2
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$
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7.49
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-
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11.28
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9.69
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1,109,401
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6.1
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836,360
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5.5
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$
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11.72
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-
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17.66
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14.75
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867,106
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8.4
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382,475
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8.3
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$
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19.56
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-
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22.92
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21.04
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685,246
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7.4
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415,032
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7.2
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4,367,899
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3,317,629
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| Summary of aggregate intrinsic-value of options exercised, exercisable, and vested and expected to vest |
The following table summarizes the aggregate intrinsic-value of options exercised, exercisable and vested and expected to vest (in thousands):
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For the Six Months Ended
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and as of June 30,
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2016
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2015
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Options Exercised
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$
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585
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$
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1,039
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Options Exercisable
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4,553
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6,991
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Options Vested and Expected to Vest
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4,574
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7,266
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| Schedule of assumptions used to estimate fair value of option awards |
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Three Months Ended
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Six Months Ended
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June 30,
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June 30,
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2016
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2015
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2016
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2015
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Expected volatility
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62
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%
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53
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%
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62
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%
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53
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-
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55
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%
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Expected dividends
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0
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%
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0
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%
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0
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%
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0
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%
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Expected terms (in years)
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6.1
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5.3
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-
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6.1
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6.1
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5.3
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-
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6.1
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Risk-free rate
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1.1
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%
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1.5
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-
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1.8
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%
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1.1
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%
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1.3
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-
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1.8
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%
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| Summary of restricted stock unit activity |
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Number of
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Weighted Average
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Shares
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Grant Date Fair Value
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Non-vested balance at December 31, 2015
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425,000
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$
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8.18
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Awarded
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1,139,846
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7.37
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Forfeited
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(50,000)
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7.32
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Non-vested balance at June 30, 2016
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1,514,846
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7.60
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| Schedule of total stock-based compensation expense classified in statements of operations |
Total stock-based compensation expense has been classified as follows in the accompanying Condensed Consolidated Statements of Operations (in thousands):
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Three Months Ended
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Six Months Ended
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June 30,
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June 30,
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2016
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2015
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2016
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2015
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Cost of revenue
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$
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47
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$
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39
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$
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90
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$
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86
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Research and development
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890
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667
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1,704
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1,439
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Sales and marketing
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600
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387
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1,109
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841
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General and administrative
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590
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586
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1,047
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1,162
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Total stock-based compensation expense
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$
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2,127
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$
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1,679
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$
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3,950
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$
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3,528
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