Notes Payable - Maturities of Long-Term Debt (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Maturities of Long-term Debt
Remainder 2016	$ 834		$ 834
2017	3,333		3,333
2018	2,500		2,500
Total	6,667		6,667
Less: discount for warrants and costs paid to lender	(146)		(146)
Less: current portion	(3,225)		(3,225)
Note payable, net of current portion and discount	3,296		3,296		$ 5,720
Credit Facility
Maturities of Long-term Debt
Interest expense	$ 200	$ 300	$ 700	$ 700