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Income Taxes - Reconciliation of Effective Tax Rate to the Statutory Rate (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Amount
Income tax (benefit) expense at federal statutory rate									$ (16,037)	$ (12,192)	$ (4,282)	$ 9,935
State income tax, net of federal benefit									(2,283)	(1,758)	(1,101)	1,295
Non-deductible warrants (income)/expense									1,360	(481)	(3,162)	(2,098)
Domestic production activity									0	0	0	(334)
Other permanent differences									106	110	137	191
Research and development tax credits									(426)	(837)	(1,632)	(1,953)
Tax reserve reassessment									104	(141)	412	246
Federal tax rate change									10,899	0	0	0
Change in valuation allowance									4,956	26,846	0	0
3PI Settlement									1,976	0	0	0
Other, net									(212)	66	(74)	462
Total tax expense (benefit)	$ (320)	$ 149	$ 135	$ 479	$ (1,238)	$ (1,792)	$ 18,000	$ (3,357)	$ 443	$ 11,613	$ (9,702)	$ 7,744
Percent
Income tax (benefit) expense at federal statutory rate									34.00%	34.00%	34.00%	34.00%
State income tax, net of federal benefit									4.80%	4.90%	8.70%	4.40%
Non-deductible warrants (income)/expense									(2.90%)	1.30%	25.10%	(7.20%)
Domestic production activity									(0.00%)	(0.00%)	(0.00%)	(1.10%)
Other permanent differences									(0.20%)	(0.30%)	(1.10%)	0.70%
Research and development tax credits									0.90%	2.30%	13.00%	(6.70%)
Tax reserve reassessment									(0.20%)	0.40%	(3.30%)	0.80%
Federal tax rate change									(23.10%)	0.00%	0.00%	0.00%
Change in valuation allowance									(10.40%)	(74.90%)	0.00%	0.00%
3PI Settlement									(4.20%)	0.00%	0.00%	0.00%
Other, net									0.40%	(0.10%)	0.60%	1.60%
Income tax expense (benefit)									(0.90%)	(32.40%)	77.00%	26.50%

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