CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 76,797	$ 33,986
Short-term investments	50,274	141,040
Prepaid expenses and other current assets	4,265	5,989
Total current assets	131,336	181,015
Equity method investment	17,319	25,814
Property and equipment, net	845	1,078
Right-of-use assets	19,837	20,563
Total assets	169,337	228,470
Current liabilities:
Accounts payable	3,393	1,144
Accrued expenses and other liabilities	17,845	18,715
Operating lease liabilities	1,701	1,561
Deferred revenue	0	1,156
Total current liabilities	22,939	22,576
Non-current liabilities:
Operating lease liabilities, net of current portion	27,023	27,916
Total liabilities	49,962	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	612,482	607,513
Accumulated other comprehensive loss	(88)	(404)
Accumulated deficit	(493,025)	(429,137)
Total stockholders’ equity	119,375	177,978
Total liabilities and stockholders' equity	$ 169,337	$ 228,470