Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 75,477	$ 92,933
Short-term investment securities	134,308	124,575
Accounts receivable, net	64,982	51,093
Inventories	77,719	39,823
Prepaid research and development and other current assets	8,095	9,519
Total current assets	360,581	317,943
Restricted cash	1,289	1,285
Long-term investment securities	1,320	0
Right of use assets	7,906	8,050
Leasehold interest, net	1,362	1,415
Equipment, net	66	95
Goodwill	799	799
Total assets	373,323	329,587
Current liabilities:
Accounts payable and accrued expenses	87,266	38,471
Other current liabilities	4,064	1,479
Lease liability – current portion	1,383	1,446
Deferred revenue - current portion	3,373	152
Accrued compensation	3,598	12,172
Total current liabilities	99,684	53,720
Deferred revenue, non-current portion	3,244	6,016
Loan payable – non-current	101,326	100,118
Lease liability – non-current	8,960	9,231
Total liabilities	213,214	169,085
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.001 par value per share (175,000,000 shares authorized, 154,607,052 and 151,465,598 shares issued, 154,565,743 and 151,424,289 shares outstanding at March 31, 2024 and December 31, 2023, respectively)	155	151
Additional paid-in capital	1,685,256	1,674,946
Treasury stock, at cost, 41,309 shares at March 31, 2024 and December 31, 2023	(234)	(234)
Accumulated deficit	(1,525,068)	(1,514,361)
Total stockholders’ equity	160,109	160,502
Total liabilities and stockholders’ equity	$ 373,323	$ 329,587