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Balance Sheets Details
 3 Months Ended
Mar. 31, 2024
Balance Sheets Details [Abstract]  
Balance Sheets Details Balance Sheets Details
Inventories
Inventories consisted of the following (in thousands):
March 31, 2024December 31, 2023
Raw materials$108 $108 
Work in process37 7 
Finished goods2,296 2,570 
Total Inventories$2,441 $2,685 
Prepaid expenses and other current assets
As of March 31, 2024, prepaid expenses and other current assets consisted of prepaid expenses of $4.7 million and other current assets of $0.5 million. As of December 31, 2023, prepaid expenses and other current assets consisted of prepaid expenses of $4.6 million and other current assets of $0.6 million.
Property and Equipment, net
Property and equipment, net consisted of the following (in thousands):
March 31, 2024December 31, 2023
Laboratory equipment$37,744 $37,216 
Leasehold improvements11,901 11,912 
Computer equipment and software2,642 2,565 
Office equipment and furniture1,116 1,469 
Construction in progress1,169 1,636 
Property and equipment54,572 54,798 
Less: accumulated depreciation and amortization(39,904)(39,311)
Property and equipment, net$14,668 $15,487 
Depreciation expense included in both research and development expenses and selling, general and administrative expenses in the unaudited condensed consolidated statements of operations was as follows (in thousands):
Three Months Ended March 31,
20242023
Research and development$1,032 $1,243 
Selling, general and administrative220 223 
Total depreciation expense
$1,252 $1,466 
Other Accrued Liabilities
Other accrued liabilities consisted of the following (in thousands):
March 31, 2024December 31, 2023
Accrued professional and outside service fees$2,482 $2,330 
Accrued purchases 2,418 1,402 
Other474 1,003 
Total other accrued liabilities$5,374 $4,735