Income Taxes - Components of Income Tax Provision (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Current tax benefit (provision): | |||
| State | $ (2) | $ (3) | $ (3) |
| Foreign | 95 | (11) | |
| Total | 93 | (3) | (14) |
| Deferred tax benefit (provision): | |||
| Federal | 838 | (31) | (437) |
| State | 52 | 12 | (2) |
| Total | 890 | (19) | (439) |
| Change in valuation allowance | (890) | 19 | 439 |
| Total benefit (provision) for income taxes | $ 93 | $ (3) | $ (14) |