Summary of Significant Accounting Policies - Summary of Cash Equivalents Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Cash and Cash Equivalents [Line Items] | ||
| Cash and cash equivalents, fair value | $ 25,764 | $ 49,750 |
| Money Market [Member] | ||
| Cash and Cash Equivalents [Line Items] | ||
| Cash and cash equivalents, fair value | 25,764 | 49,750 |
| Quoted Prices in Active Markets (Level 1) [Member] | ||
| Cash and Cash Equivalents [Line Items] | ||
| Cash and cash equivalents, fair value | 25,764 | 49,750 |
| Quoted Prices in Active Markets (Level 1) [Member] | Money Market [Member] | ||
| Cash and Cash Equivalents [Line Items] | ||
| Cash and cash equivalents, fair value | $ 25,764 | $ 49,750 |