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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Current assets:    
Cash and cash equivalents $ 31,798 $ 23,139
Marketable securities 0 15,947
Accounts receivable 408 555
Unbilled receivables 1,550 2,034
Inventories 0 1,065
Prepaid expenses and other current assets 1,770 2,323
Total current assets 35,526 45,063
Property and equipment, net 4,680 4,842
Operating lease assets 9,786 10,092
Other non-current assets 410 429
Total assets 50,402 60,426
Current liabilities:    
Accounts payable 758 1,291
Accrued liabilities 3,092 5,805
Current operating lease liabilities 1,367 1,360
Total current liabilities 5,217 8,456
Operating lease liabilities 10,707 11,036
Other non-current liabilities 277 29
Total liabilities 16,201 19,521
Commitments and contingencies (Note 9)
Stockholders' equity:    
Common stock, $0.0001 par value, 165,000,000 shares authorized as of March 31, 2024, and December 31, 2023; 26,552,572 and 25,877,865 shares issued and outstanding as of March 31, 2024, and December 31, 2023, respectively 3 3
Additional paid-in capital 459,642 459,113
Accumulated other comprehensive (loss) income (1) 3
Accumulated deficit (425,443) (418,214)
Total stockholders' equity 34,201 40,905
Total liabilities and stockholders' equity $ 50,402 $ 60,426