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Debt - Convertible Notes (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 30 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 16, 2020 | Mar. 29, 2019 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Dec. 31, 2021 | Sep. 30, 2020 | Dec. 31, 2019
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Accumulated interest on subordinated debt |  | $ 100 |  |  |  |  |  |  |
Preferred stock, par value (in usd per share) |  |  |  |  |  |  |  | $ 0.0001 | $ 0.0001
Conversion of notes to preferred stock (in shares) | [1] |  |  | 22,000 |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Conversion of notes to preferred stock (in shares) |  |  |  | 111,548 | 2,709,000 |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Conversion of notes to preferred stock (in shares) |  |  |  | 22,310 |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Interest rate on convertible notes |  |  |  |  |  |  | 10.00% |  |
Convertible Debt |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from issuance of subordinated convertible promissory notes |  |  | $ 1,700 |  |  |  |  |  |
Interest rate on convertible notes |  |  |  |  |  | 5.00% |  |  |
Unamortized issuance costs at date of issuance |  | 40 |  |  |  |  |  |  |
Net proceeds from the conversion of convertible debt to preferred stock |  | $ 1,800 |  |  |  |  |  |  |
Conversion rate (in dollars per share) |  | $ 0.67 |  |  |  |  |  |  |
Conversion of notes to preferred stock (in shares) |  | 2,709,018 |  |  |  |  |  |  |
[1] | * Shares outstanding for prior periods have been restated for the 1-for-5 reverse stock split effective June 11, 2020.

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- Definition The rate of interest that was being paid on the original debt issue that is being converted in the noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 + Details
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