Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 150,902	$ 102,304
Short-term investment securities	78,257	59,374
Accounts receivable, net	39,320	0
Inventories	33,553	0
Prepaid research and development	5,001	4,237
Other current assets	12,081	2,359
Total current assets	319,114	168,274
Restricted cash	1,282	1,273
Long-term investment securities	0	12,404
Right of use assets	8,271	8,888
Leasehold interest, net	1,468	1,627
Equipment, net	133	307
Goodwill	799	799
Total assets	331,067	193,572
Current liabilities:
Accounts payable and accrued expenses	39,741	42,019
Other current liabilities	1,217	1,017
Lease liability – current portion	1,479	1,581
Deferred revenue - current portion	6,903	152
Accrued compensation	8,338	8,432
Total current liabilities	57,678	53,201
Deferred revenue, non-current portion	190	305
Loan payable – non-current	98,908	71,135
Lease liability – non-current	9,522	10,344
Total liabilities	166,298	134,985
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.001 par value per share (175,000,000 shares authorized, 151,490,731 and 146,426,697 shares issued, 151,449,422 and 146,385,388 shares outstanding at September 30, 2023 and December 31, 2022, respectively)	151	146
Additional paid-in capital	1,664,797	1,585,708
Treasury stock, at cost, 41,309 shares at September 30, 2023 and December 31, 2022	(234)	(234)
Accumulated deficit	(1,499,945)	(1,527,033)
Total stockholders’ equity	164,769	58,587
Total liabilities and stockholders’ equity	$ 331,067	$ 193,572