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Debt (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended
--- | ---
Aug. 31, 2020 | Sep. 30, 2019
Convertible preferred stock warrant liability |  |
Debt Instrument [Line Items] |  |
Issuance costs of warrants |  | $ 0.6
Exercise price |  | $ 0.80
Loan and security agreement | Horizon Technology Finance Corporation |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity |  | $ 20.0
Interest rate on first business day of month (as a percent) |  | 2.20%
Term (in months) | 30 months | 36 months
Final payment |  | $ 0.7
Percentage of final payment on original principal |  | 3.50%
Minimum cash on deposit requirement |  | $ 5.0
Debt issuance costs and discounts |  | 1.1
Legal fees and an investment bank fee |  | $ 0.5
Loan and security agreement | LIBOR | Horizon Technology Finance Corporation |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) |  | 10.00%

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