Income Taxes (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Operating Loss Carryforwards [Line Items]
Deferred income tax benefit	$ (775,000)	$ (308,000)	$ (2,294,000)	$ (2,967,000)
Deferred tax liabilities	15,868,000		15,868,000
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Taxable income (loss)	3,930,000	8,334,000	23,680,000	(9,346,000)
Current income tax expense (benefit)	78,000	0	473,000	0
Operating loss carryforwards	243,700,000		243,700,000
Operating loss carryforwards acquired in acquisition of business	13,400,000		13,400,000
Federal and state research and development tax credits	7,800,000		7,800,000
Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Current income tax expense (benefit)	(121,000)	$ (110,000)	(343,000)	$ (323,000)
Operating loss carryforwards	$ 146,800,000		$ 146,800,000