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Notes Payable - Maturities of Long-Term Debt (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Maturities of Long-term Debt
Remainder 2016	$ 2,500
2017	3,333
2018	2,500
Total	8,333
Less: discount for warrants and costs paid to lender	226
Less: current portion	3,190
Note payable, net of current portion and discount	4,917		$ 5,720
Credit Facility
Maturities of Long-term Debt
Interest expense	$ 200	$ 100

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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-Section S99
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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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