CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 127,787	$ 240,551
Short-term investments	47,549
Accounts receivable, net	5,234	6,348
Inventory	2,674	77
Prepaid expenses and other current assets	11,365	5,402
Total current assets	194,609	252,378
Property and equipment, net	3,938	4,236
Other assets	2,653	2,904
Total assets	201,200	259,518
Current liabilities:
Accounts payable	2,302	4,461
Current portion of notes payable	3,850
Current portion of revenue interest financing payable	1,556	1,020
Accrued expenses	17,895	19,536
Total current liabilities	25,603	25,017
Notes payable, net of deferred financing costs	68,136	71,018
Revenue interest financing payable, net of deferred financing costs	31,950	29,857
Contract liabilities, net	17,016	16,285
Other long-term liabilities	1,156	1,341
Total liabilities	143,861	143,518
Stockholders' equity:
Series A convertible preferred stock, $0.001 par value; 25,000,000 shares authorized, no shares issued and outstanding at June 30, 2023; 4,043 shares issued and outstanding at December 31, 2022		4,043
Common stock, $0.001 par value; 150,000,000 shares authorized, 50,616,489 issued and 50,609,182 outstanding at June 30, 2023 and 49,650,074 issued and 49,642,767 outstanding at December 31, 2022	51	50
Additional paid-in capital	554,587	542,428
Treasury stock at cost, 7,307 shares at June 30, 2023 and December 31, 2022
Accumulated other comprehensive loss	(114)
Accumulated deficit	(497,185)	(430,521)
Total stockholders' equity	57,339	116,000
Total liabilities and stockholders' equity	$ 201,200	$ 259,518