Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 144,514	$ 47,076
Prepaid expenses and other current assets	2,591	3,126
Total current assets	147,105	50,202
Property and equipment, net	2,243	1,126
Restricted cash	0	263
Operating lease, right-of-use ("ROU") asset	4,089	0
Other assets	320	320
Total assets	153,757	51,911
Current liabilities:
Accounts payable	867	1,061
Accrued expenses	8,775	1,571
Operating lease obligations, current portion	989	0
Long-term debt, current portion	0	7,467
Total current liabilities	10,631	10,099
Long-term debt, net of current portion	0	1,867
Operating lease obligations, net of long-term portion	3,048	0
Total liabilities	13,679	11,966
Commitments and Contingencies (Note 11)
Stockholders' equity (deficit):
Preferred stock, $0.0001 par value: 10,000 shares authorized; no shares issued and outstanding as of December 31, 2021 and 2020.	0	0
Common stock, $0.0001 par value: 300,000 shares authorized; 101,303 and 52,117 shares issued at December 31, 2021 and 2020, respectively; 100,832 and 51,221 shares outstanding at December 31, 2021 and 2020, respectively.	10	5
Additional paid-in-capital	373,657	191,348
Accumulated deficit	(233,589)	(151,408)
Total stockholders' equity (deficit)	140,078	39,945
Total liabilities and stockholders' equity (deficit)	$ 153,757	$ 51,911