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Balance Sheet Details (Tables) | 12 Months Ended
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Dec. 31, 2023
Balance Sheet Related Disclosures [Abstract] |
Schedule of Cash and Cash Equivalents | Cash equivalents consisted of the following (in thousands):
| December 31, 2023 |  | December 31, 2022
| Adjusted Cost |  | Estimated Fair Value |  | Adjusted Cost |  | Estimated Fair Value
Money market funds(1) | $ | 56,374 |  |  | $ | 56,374 |  |  | $ | 77,309 |  |  | $ | 77,309 |
(1) Money market funds are classified in cash and cash equivalents on our consolidated balance sheets. Average contractual maturities (in days) is not applicable.
Schedule of Inventory Components | Inventories consisted of the following (in thousands):
| December 31,
| 2023 |  | 2022
Raw materials | $ | 108 |  |  | $ | 108 |
Work in process | 7 |  |  | 91 |
Finished goods | 2,570 |  |  | 1,830 |
Total inventories | $ | 2,685 |  |  | $ | 2,029 |
Property and Equipment, Net | Property, equipment and leasehold improvements are stated at cost less accumulated depreciation and amortization calculated using the straight-line method over their estimated useful lives as follows:
| Asset classification | Estimated useful life |
| Laboratory equipment | 5 years |
| Computer equipment and software | 3 years |
| Office equipment and furniture | 5 years |
| Leasehold improvements | Lesser of useful life or lease term |
Property and equipment, net consisted of the following (in thousands):
| December 31,
| 2023 |  | 2022
Laboratory equipment(1) | $ | 37,216 |  |  | $ | 39,679 |
Leasehold improvements | 11,912 |  |  | 16,633 |
Computer equipment and software | 2,565 |  |  | 3,039 |
Office equipment and furniture | 1,469 |  |  | 1,345 |
Construction in progress(2) | 1,636 |  |  | 1,739 |
Property and equipment | 54,798 |  |  | 62,435 |
Less: accumulated depreciation and amortization | (39,311) |  |  | (39,821) |
Property and equipment, net | $ | 15,487 |  |  | $ | 22,614 |
(1) Fully depreciated property and equipment with a cost of $3.0 million and $1.5 million were retired during the years ended December 31, 2023 and 2022, respectively. (2) Construction in progress includes equipment received but not yet placed into service pending installation. Depreciation expense included in both research and development expenses and selling, general and administrative expenses in the consolidated statements of operations was as follows (in thousands):
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
Depreciation expense | $ | 5,518 |  |  | $ | 5,402 |  |  | $ | 3,113 |
Schedule of Goodwill | Goodwill
| December 31,
| 2023 |  | 2022
Goodwill at beginning of period | $ | 3,241 |  |  | $ | 3,241 |
Impairment | (778) |  |  | — |
Goodwill at end of period | $ | 2,463 |  |  | $ | 3,241 |
Schedule of Accrued Liabilities | Other accrued liabilities consisted of the following (in thousands):
| December 31,
| 2023 |  | 2022
Accrued professional and outside service fees | $ | 2,330 |  |  | $ | 3,495 |
Accrued purchases | 1,402 |  |  | 10,852 |
Other | 1,003 |  |  | 932 |
Total other accrued liabilities | $ | 4,735 |  |  | $ | 15,279 |

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