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Convertible Note Payable (Details) - USD ($) $ in Thousands |  | 6 Months Ended
--- | --- | ---
Jan. 24, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Short-term Debt [Line Items] |  |  |
Outstanding principal and interest, convertible debt |  | $ 0 | $ 6,651
Interstate Battery Systems International, Inc. |  |  |
Short-term Debt [Line Items] |  |  |
Outstanding principal and interest, convertible debt | $ 6,700 |  |
Amortization of debt discount | 2,600 |  |
Deferred financing expenses | $ 20,000 |  |

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