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Debt - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 18 Months Ended |
--- | --- | --- | --- | ---
Jan. 15, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Jun. 30, 2020 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  | $ 4,879 |  |  | $ 4,855
Interest paid |  | $ 136 | $ 153 |  |
Secured Debt | Hercules Technology Growth Capital | Loans Payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt payments deferred, consecutive period | 13 months |  |  |  |
Scenario, Forecast | Secured Debt | Hercules Technology Growth Capital | Loans Payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amortization of principal and interest, consecutive period |  |  |  | 18 months |

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