CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 120,572	$ 240,551
Short-term investments	29,716
Accounts receivable, net	3,799	6,348
Inventory	2,413	77
Prepaid expenses and other current assets	8,746	5,402
Total current assets	165,246	252,378
Property and equipment, net	3,843	4,236
Other assets	1,819	2,904
Total assets	170,908	259,518
Current liabilities:
Accounts payable	4,003	4,461
Current portion of notes payable	11,551
Current portion of revenue interest financing payable	2,211	1,020
Accrued expenses	22,859	19,536
Total current liabilities	40,624	25,017
Notes payable, net of deferred financing costs	61,423	71,018
Revenue interest financing payable, net of deferred financing costs	33,766	29,857
Contract liabilities, net	17,545	16,285
Other long-term liabilities	785	1,341
Total liabilities	154,143	143,518
Stockholders' equity:
Series A convertible preferred stock, $0.001 par value; 25,000,000 shares authorized, no shares issued and outstanding at December 31, 2023; 4,300 shares issued and outstanding at December 31, 2022		4,043
Common stock, $0.001 par value; 150,000,000 shares authorized, 54,585,428 issued and 54,578,121 outstanding at December 31, 2023 and 49,650,074 issued and 49,642,767 outstanding at December 31, 2022	55	50
Additional paid-in capital	588,656	542,428
Treasury stock at cost, 7,307 shares at December 31, 2023 and December 31, 2022
Accumulated other comprehensive loss	(20)
Accumulated deficit	(571,926)	(430,521)
Total stockholders' equity	16,765	116,000
Total liabilities and stockholders' equity	$ 170,908	$ 259,518