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Composition of Certain Consolidated Financial Statement Items (Tables) | 12 Months Ended
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Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of Inventory | Inventory (in thousands):
|  |  | December 31,
|  |  | 2021 |  | 2020
Raw materials |  |  | $ | 6,740 |  |  | $ | 2,647 |
Work-in-process |  |  | 905 |  |  | 51 |
Finished goods |  |  | 5,502 |  |  | 4,226 |
Total inventory |  |  | $ | 13,147 |  |  | $ | 6,924 |
Prepaid Expenses and Other Current Assets | Prepaid Expenses and Other Current Assets (in thousands):
|  |  | December 31,
|  |  | 2021 |  | 2020
Insurance |  |  | $ | 2,333 |  |  | $ | 124 |
Inventory |  |  | 830 |  |  | 553 |
Software |  |  | 428 |  |  | 375 |
Rent |  |  | 253 |  |  | 245 |
Other |  |  | 398 |  |  | 356 |
Total prepaid expenses and other current assets |  |  | $ | 4,242 |  |  | $ | 1,653 |
Property and Equipment, net | Property and Equipment, Net (in thousands):
|  |  | December 31,
|  |  | 2021 |  | 2020
Laboratory, manufacturing and computer equipment, and furniture and fixtures |  |  | $ | 2,874 |  |  | $ | 2,645 |
Rental equipment |  |  | 1,082 |  |  | 1,247 |
Leasehold improvements |  |  | 4,941 |  |  | 4,941 |
Evaluation units |  |  | 2,842 |  |  | 4,229 |
Total property and equipment |  |  | 11,739 |  |  | 13,062 |
Less: accumulated depreciation and amortization |  |  | (6,694) |  |  | (4,788) |
Total property and equipment, net |  |  | $ | 5,045 |  |  | $ | 8,274 |
Other Current Liabilities | Other Current Liabilities (in thousands):
|  |  | December 31,
|  |  | 2021 |  | 2020
Accrued purchases |  |  | 1,105 |  |  | 432 |
Customer deposit |  |  | 741 |  |  | — |
Professional services |  |  | 600 |  |  | 339 |
Sales tax |  |  | 515 |  |  | 302 |
Interest |  |  | 405 |  |  | 403 |
Travel expenses |  |  | 281 |  |  | 138 |
Clinical trial expenses |  |  | 183 |  |  | 47 |
Other |  |  | 778 |  |  | 316 |
Total other current liabilities |  |  | $ | 4,608 |  |  | $ | 1,977 |
Schedule of Interest and Other Income (Expense), net | Interest and Other Income (Expense), net (in thousands):
|  |  | Year Ended December 31,
|  |  | 2021 |  | 2020 |  |
Interest income |  |  | $ | 76 |  |  | $ | 184 |  |  |
Decrease in fair value of preferred stock warrants |  |  | 64 |  |  | 185 |  |  |
Decrease (increase) in fair value of loan facility derivative liability |  |  | 135 |  |  | (300) |  |  |
Other |  |  | (154) |  |  | (25) |  |  |
Total interest and other income, net |  |  | $ | 121 |  |  | $ | 44 |  |  |

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