Restatement of Financial Statements (Details 2) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Product sales, net	$ 12,830	$ 15,709	$ 50,978	$ 48,156
Total revenues	12,851	16,151	51,150	48,946
Selling, general and administrative expenses	5,971	3,694	14,976	10,813
Total costs and expenses	20,890	15,848	58,004	46,730
Operating income (loss)	(8,039)	303	(6,854)	2,216
Loss before income tax expense	(8,958)	(2,680)	(8,940)	(6,486)
Net loss	$ (8,982)	$ (2,703)	$ (9,070)	$ (6,554)
Basic and diluted loss per share (in dollars per share)	$ (0.17)	$ (0.05)	$ (0.17)	$ (0.12)
Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Product sales, net	$ 13,634		$ 51,782
Total revenues	13,655		51,954
Selling, general and administrative expenses	4,121		13,126
Total costs and expenses	19,040		56,154
Operating income (loss)	(5,385)		(4,200)
Loss before income tax expense	(6,304)		(6,286)
Net loss	$ (6,328)		$ (6,416)
Basic and diluted loss per share (in dollars per share)	$ 0		$ 0
Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Product sales, net	$ (804)		$ (804)
Total revenues	(804)		(804)
Selling, general and administrative expenses	1,850		1,850
Total costs and expenses	1,850		1,850
Operating income (loss)	(2,654)		(2,654)
Loss before income tax expense	(2,654)		(2,654)
Net loss	$ (2,654)		$ (2,654)