Condensed Consolidated Balance Sheets - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 97,009,000	$ 102,304,000
Short-term investment securities	47,896,000	59,374,000
Accounts receivable, net	17,484,000
Inventories	30,234,000
Prepaid research and development	4,863,000	4,237,000
Other current assets	11,088,000	2,359,000
Total current assets	208,574,000	168,274,000
Restricted cash	1,279,000	1,273,000
Long-term investment securities		12,404,000
Right of use assets	8,475,000	8,888,000
Leasehold interest, net	1,521,000	1,627,000
Equipment, net	206,000	307,000
Goodwill	799,000	799,000
Total assets	220,854,000	193,572,000
Current liabilities:
Accounts payable and accrued expenses	62,945,000	42,019,000
Other current liabilities	1,569,000	1,169,000
Lease liability - current portion	1,512,000	1,581,000
Accrued compensation	6,641,000	8,432,000
Total current liabilities	72,667,000	53,201,000
Deferred revenue, net of current portion	229,000	305,000
Loan payable - non-current	97,700,000	71,135,000
Lease liability - non-current	9,805,000	10,344,000
Total liabilities	180,401,000	134,985,000
Commitments and contingencies
Stockholders' equity:
Common stock, $0.001 par value per share (175,000,000 shares authorized, 150,969,323 and 146,426,697 shares issued, 150,928,014 and 146,385,388 shares outstanding at June 30, 2023 and December 31, 2022, respectively)	151,000	146,000
Additional paid-in capital	1,654,411,000	1,585,708,000
Treasury stock, at cost, 41,309 shares at June 30, 2023 and December 31, 2022	(234,000)	(234,000)
Accumulated deficit	(1,613,875,000)	(1,527,033,000)
Total stockholders' equity	40,453,000	58,587,000
Total liabilities and stockholders' equity	$ 220,854,000	$ 193,572,000