Income Taxes - Reconciliation of Income Tax to Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Tax at statutory rate	$ (23,675)	$ (19,586)	$ 20,934
State taxes, net of federal benefit	(65)	(691)	1,499
Change in valuation allowance	16,024	(14,042)	(12,968)
Valuation allowance adjustment for continuing operations	0	15,498	0
Permanent interest disallowed	(1,832)	375	(8,608)
Foreign rate change - Impact on Deferred Taxes	521	(1,993)	0
Other permanent differences	1,307	114	1,226
Research and development tax credits	(145)	(1,060)	(1,387)
State tax rate benefit	578	2,181	(503)
Foreign rate differential	6,122	2,550	0
Credits and other	217	753	(109)
Provision for income tax benefit (expense)	$ (948)	$ (15,901)	$ 84