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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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