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Debt - Pre 2019 convertible notes (Details) $ / shares in Units, $ in Thousands |  |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 28, 2020 USD ($) shares | Dec. 23, 2020 USD ($) | Dec. 19, 2019 USD ($) shares | Jan. 13, 2019 USD ($) D $ / shares shares | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) shares | Mar. 31, 2021 USD ($) | Feb. 28, 2020 USD ($) NotesSeries | Dec. 31, 2018 USD ($) | Jul. 20, 2018 USD ($) NotesSeries
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount borrowed |  |  | $ 3,000 |  |  |  |  |  |  |  |
Interest rate (stated) |  |  | 3.00% |  |  |  |  |  |  |  |
Warrants issued on conversion | shares |  |  | 403,101 |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  | $ 29 | $ 746 |  |  |  |
Amount outstanding |  |  |  |  |  | 47,983 | 49,461 | $ 50,104 |  |  |
Loss on extinguishment of debt |  |  |  |  | $ (247) | 5,748 | (483) |  |  |  |
Original debt amount |  |  |  |  |  | 1,436 | $ 34,105 |  |  |  |
Series B Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Warrants issued on conversion | shares |  |  |  |  |  |  | 70,408 |  |  |  |
Pre-2019 Convertible Promissory Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount borrowed |  |  |  | $ 7,324 |  |  |  |  | $ 1,400 | $ 16,600 | $ 1,689
Interest rate (stated) |  |  |  | 4.50% |  |  |  |  |  |  | 3.50%
Shares issued on conversion | shares | 198,750 |  |  | 1,173,473 |  |  |  |  |  |  |
Warrants issued on conversion | shares | 73,538 |  |  | 70,408 |  |  |  |  |  |  |
Shares issuable on conversion | shares |  |  |  | 537,024 |  |  |  |  |  |  |
Conversion price (per unit) | $ / shares |  |  |  | $ 14.79 |  |  |  |  |  |  |
Shares /Warrants per unit |  |  |  | 0.06 |  |  |  |  |  |  |
Number of promissory notes assumed | NotesSeries |  |  |  |  |  |  |  |  | 1 |  | 2
Debt issuance costs |  |  |  | $ 356 |  |  |  |  |  |  |
Default amount reclassified |  |  |  |  |  | $ 7,288 |  |  |  |  |
Unpaid interest |  | $ 48 |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt | $ 247 | 285 |  |  |  |  |  |  |  |  |
Interest amount |  | 289 |  |  |  |  |  |  |  |  |
Original debt amount | $ 1,153 |  |  |  |  |  |  |  |  |  |
Maturity days threshold for notes if not converted | D |  |  |  | 10 |  |  |  |  |  |  |
Maturity period threshold for notes if not converted |  |  |  |  |  | 3 years |  |  |  |  |
Pre-2019 Convertible Promissory Notes | Maximum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate (stated) |  |  |  | 10.00% |  |  |  |  |  |  |
Pre-2019 Convertible Promissory Notes | Minimum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate (stated) |  |  |  | 8.00% |  |  |  |  |  |  |
2018 Convertible Promissory Notes | Maximum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate (stated) |  |  |  | 10.00% |  |  |  |  |  |  |
Merger Agreement | Pre-2019 Convertible Promissory Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount outstanding |  | 7,317 |  |  |  |  |  |  |  |  |
Unpaid interest |  | $ 516 |  |  |  |  |  |  |  |  |

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- Definition The number of warrants issued in exchange for the original debt being converted in a 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 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 Reference 2: 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 + Details
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