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Debt - Convertible Notes (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 12 Months Ended | 30 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 16, 2020 | Mar. 29, 2019 | Dec. 31, 2020 | Dec. 31, 2021 | Jun. 11, 2020 | Jan. 15, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |
Accumulated interest | $ 0.1 |  |  |  |  |  |
Common stock, par value (in dollars per share) |  |  | $ 0.0001 |  | $ 0.0001 |  | $ 0.0001
Preferred stock, shares authorized (in shares) |  | 2,000,000 | 5,000,000 |  |  | 5,000,000 |
Stated interest rate |  | 5.00% |  |  |  |  |
Percentage of number of votes that each share of preferred stock holders are entitled to |  |  | 11.07% |  |  |  |
Convertible Preferred Stock |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  | 3,300,000 |  |  | 3,300,000 | 2,000,000
Preferred Stock |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Conversion of convertible securities |  |  | 111,548 |  |  |  |
Common Stock |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Conversion of convertible securities |  |  | 22,310 |  |  |  |
Subsequent Event |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate on convertible notes |  |  |  | 10.00% |  |  |
Convertible Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from issuance of subordinated convertible promissory notes |  | $ 1.7 |  |  |  |  |
Net proceeds from the conversion of convertible debt to preferred stock | $ 1.8 |  |  |  |  |  |
Conversion price (in dollars per share) | $ 0.67 |  |  |  |  |  |
Shares issued (in shares) | 2,709,018 |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ 0.0001 | $ 0.0001 |  |  |  |  |

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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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