Income Taxes (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating Loss Carryforwards [Line Items]
Deferred income tax benefit	$ (638,000)	$ (2,188,000)
Deferred tax liabilities	16,504,000
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Taxable income (loss)	11,800,000	(9,900,000)
Current income tax expense (benefit)	236,000	0
Operating loss carryforwards	242,800,000
Federal and state research and development tax credits	7,600,000
Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Current income tax expense (benefit)	(131,000)	$ (93,000)
Operating loss carryforwards	$ 124,500,000