Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
CURRENT ASSETS
Cash and cash equivalents	$ 34,863	$ 15,142
Marketable securities	20,848	77,986
Development receivable	375	815
Prepaid expenses and other current assets	6,172	4,948
Total current assets	62,258	98,891
Restricted cash	1,553	1,838
Property and equipment, net	3,220	4,549
Operating lease right-of-use assets	3,430	3,806
Other non-current assets	683	842
TOTAL ASSETS	71,144	109,926
CURRENT LIABILITIES
Accounts payable	677	3,319
Operating lease liabilities	625	436
Deferred revenue	517	2,359
Accrued and other current liabilities	12,837	14,030
Total current liabilities	14,656	20,144
Non-current operating lease liabilities	4,004	4,608
Deferred revenue, net of current portion	2,179	1,217
Other non-current liabilities	0	16
TOTAL LIABILITIES	20,839	25,985
Commitments and Contingencies (Note 9)
STOCKHOLDERS’ EQUITY
Preferred stock, $0.0001 par value; 10,000,000 shares authorized as of December 31, 2022 and 2021; no shares issued and outstanding as of December 31, 2022 and 2021	0	0
Common stock, $0.0001 par value; 500,000,000 shares authorized as of December 31, 2022 and 2021, 65,350,343 shares and 49,355,130 shares issued and outstanding as of December 31, 2022 and 2021, respectively	6	5
Additional paid-in capital	475,971	425,765
Accumulated other comprehensive (loss) income	(48)	(20)
Accumulated deficit	(425,624)	(341,809)
TOTAL STOCKHOLDERS’ EQUITY	50,305	83,941
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 71,144	$ 109,926