Income Taxes - Reconciliation of Income Tax to Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Tax at statutory rate	$ (19,586)	$ 20,934	$ (24,684)
State taxes, net of federal benefit	(691)	1,499	(1,552)
Change in valuation allowance	(14,042)	(12,968)	19,526
Valuation allowance adjustment for continuing operations	15,498	0	0
Permanent interest disallowed	375	(8,608)	7,197
Foreign rate change	(1,993)	0	0
Other permanent differences	114	1,226	1,279
Research and development tax credits	(1,060)	(1,387)	(744)
State tax rate benefit	2,181	(503)	(822)
Foreign rate differential	2,550	0	0
Other	753	(109)	(200)
Provision for income tax benefit (expense)	$ (15,901)	$ 84	$ 0