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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

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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