Commitments and Contingencies (Restricted Cash and Letters of Credit) - Additional Information (Detail) - USD ($) $ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Other Commitments [Line Items] | ||
| Restricted cash | $ 270 | $ 200 |
| Money Market Instruments [Member] | ||
| Other Commitments [Line Items] | ||
| Restricted cash | 200 | $ 200 |
| Money Market Instruments [Member] | Letter of Credit [Member] | ||
| Other Commitments [Line Items] | ||
| Restricted cash | $ 70 |