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Balance Sheet Details (Tables)
 12 Months Ended
Dec. 31, 2023
Balance Sheet Related Disclosures [Abstract]  
Schedule of Cash and Cash Equivalents
Cash equivalents consisted of the following (in thousands):
 December 31, 2023December 31, 2022
 Adjusted CostEstimated Fair ValueAdjusted CostEstimated 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,
 20232022
Raw materials $108 $108 
Work in process7 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 classificationEstimated useful life
Laboratory equipment5 years
Computer equipment and software3 years
Office equipment and furniture5 years
Leasehold improvementsLesser of useful life or lease term
Property and equipment, net consisted of the following (in thousands): 
 December 31,
 20232022
Laboratory equipment(1)
$37,216 $39,679 
Leasehold improvements11,912 16,633 
Computer equipment and software2,565 3,039 
Office equipment and furniture1,469 1,345 
Construction in progress(2)
1,636 1,739 
Property and equipment54,798 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,
 202320222021
Depreciation expense$5,518 $5,402 $3,113 
Schedule of Goodwill
Goodwill
December 31,
20232022
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,
 20232022
Accrued professional and outside service fees$2,330 $3,495 
Accrued purchases1,402 10,852 
Other1,003 932 
Total other accrued liabilities
$4,735 $15,279