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Loan Payable to Silicon Valley Bank (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Feb. 21, 2017 | Dec. 31, 2017 | Mar. 23, 2017
Future Cash Payments of Loan Payable [Abstract] |  |  |
2018 |  | $ 876 |
2019 |  | 835 |
2020 |  | 386 |
Total payments of principal and interest |  | 2,097 |
Less: amounts representing interest |  | (114) |
Total payments of principal before deferred financing costs |  | 1,983 |
Less: deferred financing costs |  | (113) |
Total loan payable, net of deferred financing costs |  | 1,870 |
Bank Warrant [Member] |  |  |
Bank Warrants [Abstract] |  |  |
Warrants issued (in shares) | 8,247 |  | 7,321
Warrant exercise price (in dollars per share) | $ 4.85 |  | $ 5.46
Deferred financing costs |  | 62 |
Aggregate deferred financing costs |  | $ 196 |
Loan and Security Agreement [Member] |  |  |
Loan and Security Agreement [Abstract] |  |  |
Amount borrowed |  |  | $ 2,000
Periodic payment term | Monthly |  |
Periodic payments of principal and interest | $ 67 |  |
Base rate | 4.25% |  |
Prime rate plus variable spread per annum |  | 5.25% |
Additional final payment fee percentage | 5.80% |  |
Amortization of deferred financing costs |  | $ 116 |
Prepayment fee if prepaid more than one year but less than two years | 2.00% |  |
Prepayment fee if prepaid two years or more | 1.00% |  |
Interest rate on obligations due to bank | 5.00% |  |
Loan and Security Agreement [Member] | Minimum [Member] |  |  |
Loan and Security Agreement [Abstract] |  |  |
Minimum legal judgments or legal actions amount triggering loan default | $ 50 |  |
Loan and Security Agreement [Member] | Prime Rate [Member] |  |  |
Loan and Security Agreement [Abstract] |  |  |
Basis spread variable rate | 0.75% |  |

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