CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 39,454	$ 33,986
Short-term investments	110,571	141,040
Prepaid expenses and other current assets	3,558	5,989
Total current assets	153,583	181,015
Equity method investment	23,036	25,814
Property and equipment, net	1,062	1,078
Right-of-use assets	20,200	20,563
Total assets	197,881	228,470
Current liabilities:
Accounts payable	3,635	1,144
Accrued expenses and other liabilities	12,892	18,715
Operating lease liabilities	1,626	1,561
Deferred revenue	354	1,156
Total current liabilities	18,507	22,576
Non-current liabilities:
Operating lease liabilities, net of current portion	27,475	27,916
Total liabilities	45,982	50,492
Commitments and contingencies (Note 8)
Stockholders’ equity:
Preferred stock, $0.0001 par value, 10,000,000 shares authorized; no shares issued and outstanding at March 31, 2023 and December 31, 2022	0	0
Common stock, $0.0001 par value; 200,000,000 shares authorized; 57,794,767 and 57,483,910 shares issued and outstanding as of March 31, 2023 and December 31, 2022, respectively	6	6
Additional paid-in capital	610,056	607,513
Accumulated other comprehensive loss	(182)	(404)
Accumulated deficit	(457,981)	(429,137)
Total stockholders’ equity	151,899	177,978
Total liabilities and stockholders' equity	$ 197,881	$ 228,470