Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current Assets
Cash and cash equivalents	$ 53,689	$ 59,424
Prepaid expenses and other current assets	4,281	3,321
Total current assets	57,970	62,745
Restricted cash	2,445	2,431
Property and equipment, net	270	400
Operating lease right-of-use assets	1,462	2,207
Other assets	6	4
Total assets	62,153	67,787
Current liabilities
Accounts payable	8,765	2,657
Accrued liabilities	6,738	8,416
Operating lease obligation, current portion	2,195	2,297
Current portion of deferred revenue	4,414	4,571
Total current liabilities	22,112	17,941
Deferred revenue, net of current portion	621	3,548
Operating lease obligation, net of current portion	1,882	4,076
Warrant liability	26,881	0
Total liabilities	51,496	25,565
Commitments and contingencies (Note 7)
Stockholders' equity
Common stock, $0.0001 par value, 100,000,000 shares authorized at December 31, 2022 and December 31, 2021; 59,844,850 and 21,039,594 shares issued and outstanding at December 31, 2022 and December 31, 2021, respectively	6	2
Additional paid-in capital	626,778	582,025
Accumulated deficit	(616,127)	(539,805)
Total stockholders' equity	10,657	42,222
Total liabilities and stockholders’ equity	$ 62,153	$ 67,787