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Stockholders' Equity - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Apr. 06, 2007 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |
Common stock, shares reserved |  |  |  | 4,005,174 |
Common stock, shares purchased through issuance of warrants | 150,000 |  |  |  |
Common stock, shares purchased through issuance of warrants per share | $ 0.01 |  |  |  |
Warrant term | 7 years |  |  |  |
Stock-based compensation expense |  | $ 3,598,000 | $ 1,766,000 | $ 1,060,000 |
Stock options, outstanding |  | 1,240,935 | 1,225,117 | 1,610,988 |
Number of shares available for future grant |  | 2,441,761 |  |  |
Closing price of common stock |  | $ 28.29 |  |  |
Aggregate intrinsic value of stock options exercised |  | $ 4,942,000 | $ 10,475,000 | $ 3,723,000 |
Weighted average grant date fair value of share-based awards granted |  | $ 22.45 | $ 11.12 | $ 4.31 |
Total fair value of stock options vested |  | $ 2,317,000 | $ 1,084,000 | $ 991,000 |
Total unrecognized compensation cost |  | $ 6,547,000 |  |  |
Unrecognized compensation cost, weighted average remaining requisite service period |  | 3 years 29 days |  |  |
Number of unvested options |  | 623,652 |  |  |
Employee Stock Option | Former president and chief executive officer |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |
Stock-based compensation expense |  | $ 826,000 |  |  |
Employee Stock Option | Former president and chief executive officer | Vested as of January 2015 |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |
Incentive options, vesting percentage |  | 50.00% |  |  |
Employee Stock Option | Minimum |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |
Incentive options, vesting period |  |  |  |  | 3 years
Employee Stock Option | Minimum | Vest Over Three Year |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |
Incentive options, vesting percentage |  |  |  |  | 20.00%
Employee Stock Option | Maximum |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |
Incentive options, vesting period |  |  |  |  | 5 years
Incentive options, term |  |  |  |  | 10 years
Employee Stock Option | Maximum | Vest Over Five Year |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |
Incentive options, vesting percentage |  |  |  |  | 33.00%
Non-Employee Directors |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |
Incentive options, vesting period |  |  |  |  | 1 year
Unvested Options |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |
Incentive options, vesting period |  | 5 years |  |  |

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