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Income Taxes - Difference between Income Taxes Computed at Federal Statutory Rate and Provision for Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Expected income tax benefit at statutory rate $ 5,489 $ (25,370)
Permanent differences 123 (357)
Adjustment to NOL 1,119 0
Remeasurement of deferred balances due to federal rate change 0 (4,140)
State tax, tax effected 146 97
Prior year differences (210) 779
Stock-based compensation differences 112 0
Other 13 (28)
Total income tax (benefit) expense $ 6,792 $ (29,019)