Stock Option Plans (Tables)
|
12 Months Ended |
Dec. 31, 2016 |
|---|
| Stock Option Plans |
|
| Summary of stock option activity |
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|
Options Outstanding
|
|
|
|
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Shares
Available
for Grant
|
|
Number
of Options
|
|
Weighted-
Average
Exercise
Price
|
|
|
Balance at December 31, 2015
|
|
|
2,559,499
|
|
|
784,136
|
|
$
|
4.09
|
|
|
Additional shares authorized
|
|
|
1,496,001
|
|
|
|
|
|
|
|
|
Options granted
|
|
|
(1,813,400
|
)
|
|
1,813,400
|
|
|
15.09
|
|
|
Options exercised
|
|
|
—
|
|
|
(13,454
|
)
|
|
0.28
|
|
|
Options forfeited
|
|
|
233,500
|
|
|
(233,500
|
)
|
|
11.35
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Balance at December 31, 2016
|
|
|
2,475,600
|
|
|
2,350,582
|
|
$
|
11.88
|
|
|
|
|
|
|
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| Summary of information about stock options outstanding |
|
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|
Options Outstanding
at December 31, 2016
|
|
Options Vested
at December 31, 2016
|
|
|
Exercise Price
|
|
Number
|
|
Weighted
Average
Remaining
Contractual Life
(in Years)
|
|
Weighted
Average
Exercise Price
|
|
Number
|
|
Weighted
Average
Remaining
Contractual Life
(in Years)
|
|
Weighted
Average
Exercise
Price
|
|
|
$0.28
|
|
|
419,682
|
|
|
8.46
|
|
$
|
0.28
|
|
|
159,732
|
|
|
8.44
|
|
$
|
0.28
|
|
|
$4.65
|
|
|
144,500
|
|
|
8.81
|
|
$
|
4.65
|
|
|
42,449
|
|
|
8.81
|
|
$
|
4.65
|
|
|
$6.75
|
|
|
5,000
|
|
|
8.87
|
|
$
|
6.75
|
|
|
1,438
|
|
|
8.87
|
|
$
|
6.75
|
|
|
$13.34 - 16.37
|
|
|
1,781,400
|
|
|
9.42
|
|
$
|
15.21
|
|
|
193,867
|
|
|
9.18
|
|
$
|
15.14
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2,350,582
|
|
|
9.21
|
|
$
|
11.88
|
|
|
397,486
|
|
|
8.84
|
|
$
|
8.02
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
Options Outstanding
at December 31, 2015
|
|
Options Vested
at December 31, 2015
|
|
|
Exercise Price
|
|
Number
|
|
Weighted
Average
Remaining
Contractual Life
(in Years)
|
|
Weighted
Average
Exercise Price
|
|
Number
|
|
Weighted
Average
Remaining
Contractual Life
(in Years)
|
|
Weighted
Average
Exercise
Price
|
|
|
$0.28 - $4.65
|
|
|
629,136
|
|
|
9.54
|
|
$
|
1.28
|
|
|
9,637
|
|
|
9.06
|
|
$
|
0.28
|
|
|
$6.75 - $15.79
|
|
|
155,000
|
|
|
10.00
|
|
$
|
15.50
|
|
|
—
|
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|
|
|
|
|
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|
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|
|
|
784,136
|
|
|
9.63
|
|
$
|
4.09
|
|
|
9,637
|
|
|
9.06
|
|
$
|
0.28
|
|
|
|
|
|
|
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| Schedule of options outstanding and exercisable that had vested or were expected to vest |
Options outstanding and exercisable that had vested or were expected to vest at December 31, 2016 were as follows:
|
|
|
Number of shares
|
|
Weighted
Average
Exercise Price
|
|
Weighted
Average
Remaining
Contractual
Life (years)
|
|
Aggregate
Intrinsic
Value
(in thousands)
|
|
|
Vested
|
|
|
397,486
|
|
$
|
8.02
|
|
|
8.84
|
|
$
|
2,660
|
|
|
Expected to vest
|
|
|
1,953,096
|
|
$
|
12.66
|
|
|
9.27
|
|
$
|
4,869
|
|
|