CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 71,093	$ 201,661
Short-term investments	101,580	46,459
Interest receivable	91	50
Prepaid expenses and other current assets	3,753	5,178
Total current assets	176,517	253,348
Restricted cash	852	852
Other assets	857	1,102
Property and equipment, net	997	1,549
Operating lease right-of-use assets	20,772	29,743
Total assets	199,995	286,594
Current liabilities:
Accounts payable	5,518	8,361
Accrued expenses	13,115	20,152
Income tax payable	154	1,007
Operating lease liability, current	2,238	6,591
Amount due to related party	563	1,742
Total current liabilities	21,588	37,853
Operating lease liability, long term	20,270	23,475
Total liabilities	41,858	61,328
Commitments and contingencies (see "Note 5 - Leases")
Stockholders’ equity:
Preferred stock, $0.0001 par value: 10,000,000 shares authorized at June 30, 2022 and December 31, 2021, respectively; 0 shares issued and outstanding at June 30, 2022 and December 31, 2021, respectively
Common stock, $0.0001 par value: 150,000,000 shares authorized at June 30, 2022 and December 31, 2021, respectively; 65,562,014 and 65,170,332 shares issued at June 30, 2022 and December 31, 2021, respectively; and 64,788,103 and 63,565,886 shares outstanding at June 30, 2022 and December 31, 2021, respectively	7	7
Additional paid-in capital	544,141	522,479
Accumulated other comprehensive loss	(444)	(155)
Accumulated deficit	(385,567)	(297,065)
Total stockholders’ equity	158,137	225,266
Total liabilities and stockholders’ equity	$ 199,995	$ 286,594