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Income Tax Disclosure Reconciliation of Federal Tax Rate (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure - Reconciliation of Federal Tax Rate [Abstract]      
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate $ (13,464) $ (26,443) $ (25,338)
Income Tax Reconciliation, State and Local Income Taxes 46 18 3
Income Tax Reconciliation, Nondeductible Expense 414 373 457
Income Tax Reconciliation, Nondeductible Expense, Other 0 245 (4)
Effective income tax reconciliation, Statutory to GAAP adjustments (221) (77) (274)
Effective Income Tax Rate Reconciliation, Tax Expense, Foreign, Amount 0 0 2
Income Tax Reconciliation, Nondeductible Expense, Share-based Compensation Cost (394) (3,405) 604
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount (153) 0 49
Income Tax Reconciliation, Tax Credits (1,656) (1,711) (1,663)
Income Tax Reconciliation, Other Adjustments (1,824) 2,625 0
Effective Income Tax Rate Reconciliation, Change related to Prior Years (4,800) (2,331) (856)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount 1,835 31,359 0
Income Tax Reconciliation, Change in Deferred Tax Assets Valuation Allowance 20,417 (504) 27,490
Income Tax Expense (Benefit) $ 200 $ 149 $ 470