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Equity Plans and Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
May. 27, 2015 shares | May. 31, 2014 shares | Jan. 31, 2011 shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2013 USD ($) Employee $ / shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of shares of Common Stock outstanding |  |  |  | 2,891,000 | 1,820,000 |
Total intrinsic value of options exercised | $ |  |  |  | $ 400 | $ 100 | $ 300
Total fair value of stock options vested | $ |  |  |  | $ 6,900 | 5,600 | 12,100
Options and restricted stock units outstanding |  |  |  | 80,000 |  |
Expected dividend yield |  |  |  | 0.00% |  |
Stock-based compensation expense | $ |  |  |  | $ 9,316 | $ 6,089 | $ 12,340
Number of employees under stock option | Employee |  |  |  |  |  | 5
Total unrecognized compensation cost related to non-vested equity awards | $ |  |  |  | 3,200 |  |
Employee |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense | $ |  |  |  |  |  | $ 4,900
Non Employee Awards |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense | $ |  |  |  |  |  | 500
Additional |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense | $ |  |  |  |  |  | $ 1,300
Restricted Stock Units (RSUs) |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock based compensation expense related to restricted stock | $ |  |  |  | 800 |  |
Aggregate intrinsic value | $ |  |  |  | $ 4,700 |  |
Grant date fair value of restricted stock | $ / shares |  |  |  | $ 20.05 | $ 17.92 | $ 12.30
Total fair value of restricted stock units | $ |  |  |  | $ 100 | $ 0 | $ 100
Employee Stock Option |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Expiration period |  |  |  | 10 years |  |
Options vesting period |  |  |  | 4 years |  |
2004 Stock Incentive Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of shares of Common Stock outstanding |  |  |  | 292,901 |  |
2010 Employment Inducement Award Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of shares of Common Stock outstanding |  |  |  | 12,450 |  |
2011 Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of shares of Common Stock outstanding |  |  |  | 2,585,223 |  |
Expiration period |  |  | 10 years |  |  |
Shares reserved and approved for issuance |  |  |  | 2,097,384 |  |
2011 Plan | Maximum |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Issuance of common stock shares |  |  | 11,000,000 |  |  |
Increase in the aggregate number of shares of common stock authorized for issuance | 2,250,000 |  |  |  |  |
Time Based Vesting Schedule |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Total unrecognized compensation cost related to non-vested equity awards | $ |  |  |  | $ 19,400 |  |
Total unrecognized compensation cost, weighted-average vesting period |  |  |  | 2 years 7 months 6 days |  |
2004 Employee Stock Purchase Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Shares reserved and approved for issuance |  |  |  | 99,600 |  |
Shares issued to employees |  |  |  | 94,709 |  |
Shares remaining available for future purchases |  |  |  | 0 |  |
2014 Employee Stock Purchase Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Total unrecognized compensation cost related to non-vested equity awards | $ |  |  |  | $ 200 |  |
Total unrecognized compensation cost, weighted-average vesting period |  |  |  | 7 months 6 days |  |
Shares issued to employees |  | 50,000 |  | 21,979 |  |
Shares remaining available for future purchases |  |  |  | 28,021 |  |
2014 Employee Stock Purchase Plan | The commencement of the offer period (generally, the sixteenth day in February or August) |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Purchase price per share as percentage of fair market value of common stock |  | 85.00% |  |  |  |
2014 Employee Stock Purchase Plan | The exercise date, which is the last day of a purchase period (generally, the fifteenth day in February or August) |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Purchase price per share as percentage of fair market value of common stock |  | 85.00% |  |  |  |

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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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