Condensed Consolidated Balance Sheets - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Current assets
Cash and cash equivalents	$ 12,456,000	$ 14,852,000
Prepaid expenses	5,745,000	3,664,000
Other receivables	8,633,000	8,531,000
Total current assets	26,834,000	27,047,000
Restricted cash	5,720,000	5,960,000
Property and equipment, net	8,807,000	3,617,000
Operating lease right-of-use asset	43,652,000	43,035,000
In-process research and development	10,256,000	10,256,000
Goodwill	3,490,000	3,490,000
Other assets	2,453,000	2,429,000
Total assets	101,212,000	95,834,000
Current liabilities
Accounts payable and accrued liabilities	9,584,000	6,034,000
Accrued compensation	1,098,000	1,828,000
Current portion of operating lease liabilities	14,528,000	17,011,000
Convertible debt	26,352,000
Total current liabilities	51,562,000	24,873,000
Operating lease liabilities, net of current portion	27,430,000	31,804,000
Deferred tax liability	3,077,000	3,077,000
Total liabilities	82,069,000	59,754,000
Stockholders' equity
Common stock, $0.01 par value; 217,000,000 shares authorized; 36,127,306 and 36,144,706 shares issued and outstanding at June 30, 2023 and December 31, 2022, respectively	361,000	361,000
Additional paid-in capital	276,593,000	275,493,000
Accumulated deficit	(257,811,000)	(239,774,000)
Total stockholders' equity	19,143,000	36,080,000
Total liabilities and stockholders' equity	$ 101,212,000	$ 95,834,000