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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:    
Net operating loss carryforwards $ 16,146 $ 28,200
Depreciation and amortization 6,229 6,688
Accrued expenses 2,082 1,183
Capitalized start-up costs 10,037 8,531
Other 75 259
Deferred tax assets before valuation allowance 34,569 44,861
Valuation allowance (34,569) (43,751)
Deferred tax assets, net   1,110
Deferred tax liabilities    
IPR&D   (36)
Change in accounting method   (1,074)
Total deferred tax liabilities   (1,110)
Net deferred tax assets $ 0 $ 0