Long-Term Debt - Components of interest expense (Details) - USD ($) $ in Thousands		12 Months Ended
	Apr. 17, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Amortization of deferred financing costs		$ 385	$ 343	$ 298
Accretion of debt discount associated with Warrant		581
Accretion of discount associated with additional warrant feature		199
Mark to market of the additional warrant feature		(80)
Total interest expense		1,796
Term Loan [Member] | 2015 Credit Agreement [Member]
Debt Instrument [Line Items]
Interest expense on debt		529
Accretion of termination fees (over term of Term Loan at rate of 8%)		88
Exit fee (percent)	8.00%
Term Loan [Member] | 2015 Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Spread on variable rate (percent)	14.00%
Line of Credit [Member] | 2013 Loan and Security Agreement [Member]
Debt Instrument [Line Items]
Interest expense on debt		$ 94