Preferred Stock, Common Stock and Stockholders' Equity - Stock Options - Additional Information (Detail)
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1 Months Ended |
12 Months Ended |
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Feb. 29, 2016
USD ($)
$ / shares
shares
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Dec. 31, 2015
USD ($)
Option
$ / shares
shares
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Dec. 31, 2014
USD ($)
$ / shares
shares
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Jan. 01, 2016
shares
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Aug. 31, 2013
shares
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May. 31, 2007
shares
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| Stock-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Common stock reserved for issuance |
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1,276,765
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1,043,457
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| Options available for future grant |
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78,854
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188,370
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| Number of stock options granted |
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354,000
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| Intrinsic value, common stock price | $ / shares |
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$ 3.30
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$ 5.90
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| Stock options vested |
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270,998
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| Number of stock options unvested |
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507,421
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424,419
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| Total intrinsic value of stock options exercised | $ |
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$ 33,810
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| Intrinsic value of stock option exercised, common stock price | $ / shares |
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$ 6.73
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| Weighted Average Grant Date Fair Value Per Share, Granted | $ / shares |
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$ 4.03
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$ 4.76
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| Number of stock options exchanged, outstanding |
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1,037,500
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683,500
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| Replacement stock options exercise price | $ / shares |
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$ 7.19
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$ 7.67
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| Unrecognized compensation costs | $ |
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$ 2,300,000
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| Weighted average period |
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1 year 1 month 17 days
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| Subsequent Event [Member] |
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| Stock-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of stock options exchanged, outstanding |
703,500
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| Options Granted [Member] |
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| Stock-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options granted, weighted average term |
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10 years
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| Number of stock options granted |
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354,000
|
64,000
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| Options Granted [Member] | Minimum [Member] |
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| Stock-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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|
|
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| Options granted, vesting period |
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1 year
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| Options Granted [Member] | Maximum [Member] |
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|
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| Stock-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
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| Options granted, vesting period |
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4 years
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| 2007 Equity Incentive Plan [Member] |
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| Stock-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Common stock reserved for issuance |
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0
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450,000
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| Issuance of common stock upon exercise of stock option, Shares |
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332,000
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| Stock options vested |
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287,000
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287,000
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|
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| Number of stock options unvested |
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45,000
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|
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| Number of options exercised | Option |
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0
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| 2013 Equity Incentive Award Plan [Member] |
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| Stock-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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|
|
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| Common stock reserved for issuance |
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|
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510,000
|
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| Additional common stock reserved for issuance |
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488,354
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| Shares of common stock available for issuance description |
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In addition, the number of shares of common stock available for issuance under the 2013 Plan will be annually increased on the first day of each fiscal year during the term of the 2013 Plan, beginning with the 2014 fiscal year, by an amount equal to the least of: (i) 300,000 shares; (ii) four percent of the outstanding shares of common stock as of the last day of the immediately preceding fiscal year; or (iii) such other amount as the Company’s board of directors may determine.
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| Options available for future grant |
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78,854
|
|
|
|
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| 2013 Equity Incentive Award Plan [Member] | Subsequent Event [Member] |
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| Stock-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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|
|
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| Common stock reserved for issuance |
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|
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288,071
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|
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| Options available for future grant |
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366,925
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| 2013 Equity Incentive Award Plan [Member] | Annual Increase in Shares [Member] |
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| Stock-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Common stock reserved for issuance |
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300,000
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| Reserve percentage for issuance of shares |
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4.00%
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| One-Time Option Exchange Program [Member] | Subsequent Event [Member] |
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| Stock-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options available for future grant |
175,876
|
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| Options granted, vesting period |
3 years
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| Number of stock options exchanged, outstanding |
527,624
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|
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| Number of stock options exchange percentage |
75.00%
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| Replacement stock options exercise price | $ / shares |
$ 3.04
|
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| Incremental compensation expense during period under option exchange | $ |
$ 4,700
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| Unrecognized compensation costs | $ |
$ 141,000
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| Weighted average period |
3 years
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