Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Deferred tax assets: | ||
| Net operating loss carryforwards | $ 28,200 | $ 18,933 |
| Depreciation and amortization | 6,688 | 7,235 |
| Accrued expenses | 1,183 | 698 |
| Capitalized start-up costs | 8,531 | 7,276 |
| Capitalized R&D | 27 | |
| Other | 259 | 67 |
| Deferred tax assets before valuation allowance | 44,861 | 34,236 |
| Valuation allowance | (43,751) | (31,966) |
| Deferred tax assets, net | 1,110 | 2,270 |
| Deferred tax liabilities | ||
| IPR&D | (36) | (121) |
| Change in accounting method | (1,074) | (2,149) |
| Total deferred tax liabilities | (1,110) | (2,270) |
| Net deferred tax assets | $ 0 | $ 0 |