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Income Taxes - Reconciliation of Expected Federal Income Taxes at Statutory Rates (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Amount                      
Federal statutory rate                 $ 12,859 $ (10,542) $ 589
State income taxes, net of federal benefit                 987 (781) 31
Disallowed compensation                 0 0 721
Permanent differences                 84 35 52
Tax credits                 (2,419) (38,998) (25,607)
Valuation allowances                 (72,359) 50,066 23,794
Changes in state effective rates                 (125) (243) 716
Stock-based compensation                 36 487 0
Other                 (1) (4) 0
Total income tax (benefit) expense $ (61,673) $ 583 $ 99 $ 53 $ (131) $ 44 $ 63 $ 44 $ (60,938) $ 20 $ 296