Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 21,116	$ 46,345
Short-term investments	197,311	92,012
Accounts receivable, net	318	28
Inventory	336	0
Prepaid expenses and other current assets	4,291	2,481
Total current assets	223,372	140,866
Property and equipment, net of accumulated depreciation and amortization of $4,391 and $3,984, respectively	2,134	2,071
Goodwill	44,543	44,543
Operating lease right-of-use-assets	5,687	6,407
Other assets	743	412
Total assets	276,479	194,299
Current liabilities:
Accounts payable	12,036	10,395
Accrued liabilities	20,225	12,777
Total current liabilities	32,261	23,172
Long-term debt, net	99,265	48,579
Long-term operating lease liabilities	5,443	5,424
Total liabilities	136,969	77,175
Commitments and contingencies
Stockholders’ Equity:
Preferred stock, $0.01 par value; 5,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $0.001 par value; 300,000,000 shares authorized; 245,792,668 and 189,213,948 shares issued, respectively	245	189
Additional paid-in capital	1,859,346	1,709,144
Accumulated deficit	(1,717,083)	(1,589,720)
Accumulated other comprehensive loss	(113)	(428)
Treasury stock, at cost, 867,973 and 488,205 shares, respectively	(2,885)	(2,061)
Total stockholders’ equity	139,510	117,124
Total liabilities and stockholders’ equity	$ 276,479	$ 194,299