Income Taxes - Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Tax expense at U.S. federal income tax rate	$ (6,886)	$ 16,371	$ (3,226)
State income taxes, net of federal income tax effect	541	1,465	205
Effect of non-US operations	(306)	(1,632)	(644)
Nontaxable contingent liability fair value changes and goodwill impairment	13,083	(14,334)	3,828
Research and development credit	(422)	(376)	(1,046)
Change in valuation allowances	5,173	850	607
Prior year provision to return adjustment	372	(172)	0
Write-off of deferred taxes and tax receivables	858	0	0
Change in valuation allowances	252	141	(280)
Prior year provision to return adjustment	$ 12,665	$ 2,313	$ (556)