CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 104,253	$ 120,572
Short-term investments	9,000	29,716
Accounts receivable, net	3,513	3,799
Inventory	5,783	2,413
Prepaid expenses and other current assets	8,727	8,746
Total current assets	131,276	165,246
Property and equipment, net	3,735	3,843
Other assets	2,339	1,819
Total assets	137,350	170,908
Current liabilities:
Accounts payable	6,125	4,003
Current portion of notes payable	15,401	11,551
Current portion of revenue interest financing payable	2,511	2,211
Accrued expenses	18,721	22,859
Total current liabilities	42,758	40,624
Notes payable, net of deferred financing costs	58,072	61,423
Revenue interest financing payable, net of deferred financing costs	34,642	33,766
Contract liabilities, net	17,730	17,545
Other long-term liabilities	582	785
Total liabilities	153,784	154,143
Stockholders' equity:
Common stock, $0.001 par value; 150,000,000 shares authorized, 54,938,349 issued and 54,931,042 outstanding at March 31, 2024 and 54,585,428 issued and 54,578,121 outstanding at December 31, 2023	55	55
Additional paid-in capital	594,106	588,656
Treasury stock at cost, 7,307 shares at March 31, 2024 and December 31, 2023
Accumulated other comprehensive loss		(20)
Accumulated deficit	(610,595)	(571,926)
Total stockholders' (deficit) equity	(16,434)	16,765
Total liabilities and stockholders' (deficit) equity	$ 137,350	$ 170,908