Condensed Consolidated Balance Sheets (Unaudited) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Current Assets:
Cash and cash equivalents	$ 92,199,000	$ 103,554,000
Prepaid expenses and other current assets	3,174,000	1,719,000
Total current assets	95,373,000	105,273,000
Property and equipment, net	210,000	242,000
Operating lease right-of-use asset	549,000	640,000
Other assets	2,255,000	2,397,000
Total assets	98,387,000	108,552,000
Current Liabilities:
Accounts payable	3,222,000	2,901,000
Accrued expenses	4,152,000	5,802,000
Operating lease liability	392,000	381,000
Total current liabilities	7,766,000	9,084,000
Long-term debt, net	4,841,000	4,819,000
Operating lease liabilities, less current portion	175,000	278,000
Stockholders' equity (deficit):
Convertible preferred stock, $0.0001 par value; 10,000,000 shares authorized as of March 31, 2022; 10,248 shares issued and outstanding as of March 31, 2022 and December 31, 2021	5,452,000	5,452,000
Common stock, $0.0001 par value; 400,000,000 shares authorized; 37,486,177 and 37,424,863 shares issued and outstanding at March 31, 2022 and December 31, 2021, respectively	4,000	4,000
Additional paid-in capital	256,372,000	254,592,000
Accumulated deficit	(176,223,000)	(165,677,000)
Total stockholders' equity (deficit)	85,605,000	94,371,000
Total liabilities and stockholders' equity (deficit)	$ 98,387,000	$ 108,552,000