CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)	Sep. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 61,103,000	$ 34,871,000
Restricted cash	364,000	364,000
Marketable securities	133,684,000	148,851,000
Interest and other receivables	22,223,000	1,763,000
Prepaid and other current assets	4,696,000	1,357,000
Total current assets	222,070,000	187,206,000
Noncurrent marketable securities		28,651,000
Property and equipment, net	733,000	650,000
Operating leases, right-of-use assets	4,296,000	4,727,000
Deposits and other assets	5,507,000	4,800,000
Total assets	232,606,000	226,034,000
Current liabilities:
Accounts payable	8,183,000	6,687,000
Accrued compensation and benefits	7,637,000	8,099,000
Operating lease liabilities	919,000	901,000
Debt	12,959,000
Accrued liabilities	53,111,000	29,834,000
Total current liabilities	82,809,000	45,521,000
Noncurrent operating lease liabilities	3,826,000	4,267,000
Noncurrent debt	37,799,000	49,830,000
Commitments and contingencies
Stockholders' equity:
Common stock	382,000	324,000
Additional paid-in capital	1,479,417,000	1,398,006,000
Accumulated deficit	(1,371,007,000)	(1,271,741,000)
Accumulated other comprehensive loss	(620,000)	(173,000)
Total stockholders' equity	108,172,000	126,416,000
Total liabilities and stockholders' equity	$ 232,606,000	$ 226,034,000