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v3.22.1

Significant Accounting Policies and Estimates (Details) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) segment shares | Dec. 31, 2020 USD ($) | May 26, 2020 shares | May 25, 2020 shares | May 03, 2020 shares | Aug. 28, 2019 shares
Allowance for doubtful accounts | $ 4 | $ 1 |  |  |  |
Raw materials | 178 | 190 |  |  |  |
Work-in-progress | 88 | 22 |  |  |  |
Finished goods | 25 | 21 |  |  |  |
prepaid insurance | 23 | 16 |  |  |  |
General prepaid expenses | 54 | 9 |  |  |  |
Remaining performance obligations | 0 | 0 |  |  |  |
Warrants issued for equity raising costs |  | 65 |  |  |  |
Proceeds from issuance of convertible promissory notes | $ 2,957 | $ 100 |  |  |  |
Number of operating segments | segment | 1 |  |  |  |  |
2019 Plan |  |  |  |  |  |
Common stock reserved for issuance | shares | 571,429 |  | 57,143 | 2,000,000 | 485,714 | 57,143
Number of shares available for grant | shares | 434,939 |  |  |  |  | 17,000,000
2019 Plan | Executive officer |  |  |  |  |  |
Number of shares available for grant | shares |  |  | 14,285 |  |  | 500,000

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