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Notes Payable - Future Principal Payments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Estimated future principal payments
2018	$ 2,500
Total	2,500
Less: discount for warrants and costs paid to lenders	(21)
Less: current portion	(2,479)
Notes payable, net of current portion and discount		$ 2,479
Credit Facility
Estimated future principal payments
Interest expense	$ 500	$ 800	$ 1,000

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

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-Publisher FASB
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