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Income Taxes - Reconciliation Effective Tax Rate (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Taxes      
Provision for income taxes $ 0 $ 0 $ 0
Reconciliation of statutory federal income tax      
Tax at statutory federal rate (34.00%) (34.00%) (34.00%)
State taxes, net of federal benefit (1.50%) (1.90%) (2.70%)
Stock-based compensation 1.30% 0.80% 2.80%
Nondeductible fair value adjustment (2.50%)    
Nondeductible interest 2.00%    
Change in valuation allowance 33.30% 34.30% 37.90%
Other 1.40% 0.80% (4.00%)
Provision for income taxes 0.00% 0.00% 0.00%