Consolidated Balance Sheets (Unaudited) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 66,126,000	$ 64,371,000
Accounts receivable	736,000	3,142,000
Prepaid expenses and other current assets	2,142,000	955,000
Total current assets	69,004,000	68,468,000
Property and equipment, net	1,765,000	2,112,000
Operating lease right-of-use	9,899,000	9,810,000
Deposits	3,797,000	2,721,000
Restricted cash	150,000	150,000
Other long-term assets	134,000	140,000
Total assets	84,749,000	83,401,000
Current liabilities:
Accounts payable	1,568,000	2,591,000
Accrued expenses	3,559,000	4,620,000
Research and development contract liability, current portion	0	645,000
Operating lease liability, current portion	3,196,000	4,932,000
Total current liabilities	8,323,000	12,788,000
Operating lease liability	6,757,000	5,121,000
Long-term debt, net	9,913,000	0
Total liabilities	24,993,000	17,909,000
Commitments and contingencies (Note 10)
Stockholders’ equity:
Preferred stock, $0.001 par value; 10,000,000 shares authorized and 0 shares issued and outstanding at June 30, 2022 and December 31, 2021	0	0
Common stock, $0.001 par value; 100,000,000 shares authorized; 35,381,743 and 32,202,496 shares issued and outstanding, at June 30, 2022 and December 31, 2021, respectively	35,000	32,000
Additional paid in capital	284,630,000	262,906,000
Accumulated deficit	(224,909,000)	(197,446,000)
Total stockholders’ equity	59,756,000	65,492,000
Total liabilities and stockholders’ equity	$ 84,749,000	$ 83,401,000