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Related Parties (Tables) | 12 Months Ended
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Dec. 31, 2021
Related Party Transactions [Abstract] |
Schedule of Related Party Transactions and Balances | Revenue, accounts receivable, and contract liabilities for stockholders of the Company who were also related parties were as follows (in thousands)—these stockholders no longer qualified as related parties in 2021:
|  | Year ended December 31, |
|  | 2021 |  |  | 2020 |
Prototype sales: |  |  |  |  |  |  |  |
Stockholder A |  | $ | — |  |  | $ | 60 |
Development contracts: |  |  |  |  |  |  |  |
Stockholder B |  | $ | — |  |  | $ | 100 |
Stockholder C |  | $ | — |  |  | $ | 1,050 |
|  | Year ended December 31, |
|  | 2021 |  |  | 2020 |
Accounts receivable: |  |  |  |  |  |  |  |
Stockholder A |  | $ | — |  |  | $ | 22 |
|  | Year ended December 31, |
|  | 2021 |  |  | 2020 |
Contract liabilities (current): |  |  |  |  |  |  |  |
Stockholder B |  | $ | — |  |  | $ | 65 |
Stockholder D |  | $ | — |  |  | $ | 500 |

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- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
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