Description of Business and Basis of Presentation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |
1 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|
May. 31, 2015 |
Feb. 28, 2014 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Organization Consolidation And Presentation Of Financial Statements [Line Items] | |||||
| Proceeds from issuance of common stock | $ 45,438 | $ 94,148 | |||
| Underwriting discounts and commissions | $ 1,399 | ||||
| Preferred stock conversion basis | In connection with the close of the IPO, all of the outstanding shares of Series A mandatorily redeemable, convertible preferred stock (Series A preferred stock), Series B mandatorily redeemable, convertible preferred stock (Series B preferred stock) and Series C mandatorily redeemable, convertible preferred stock (Series C preferred stock) were converted into shares of common stock on a one-for-one basis immediately prior to the closing of the IPO. | ||||
| IPO [Member] | |||||
| Organization Consolidation And Presentation Of Financial Statements [Line Items] | |||||
| Common stock shares issued | 2,750,000 | 6,900,000 | |||
| Sale of stock price per share | $ 17.75 | $ 15.00 | |||
| Proceeds from issuance of common stock | $ 45,400 | $ 92,700 | |||
| Underwriting discounts and commissions | 2,900 | 7,200 | |||
| Offering expenses | $ 3,500 | ||||
| Offering cost incurred | $ 400 | ||||