CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 38,065	$ 34,607
Available-for-sale securities	49,876	69,954
Accounts receivable from related party	4,400
Prepaid expenses and other current assets	3,527	3,469
Total current assets	95,868	108,030
Property and equipment, net	4,253	4,526
Right-of-use asset, operating	9,409	9,859
Right-of-use asset, finance		34
Other assets	924	924
Total assets	110,454	123,373
Current liabilities:
Accounts payable	1,278	1,064
Accrued expenses and other current liabilities	7,603	8,409
Deferred collaboration liability, current	10,710	9,383
Operating lease liability, current	3,588	3,567
Finance lease liability, current		19
Total current liabilities	23,179	22,442
Long-term liabilities:
Deferred collaboration liability, long term	5,716	6,765
Operating lease liability, long-term	9,810	10,467
Other long-term liabilities	1,905	1,906
Total liabilities	40,610	41,580
Commitments and contingencies (Note 7)
Stockholders' equity:
Preferred stock, $0.001 par value; 5,000,000 shares authorized, no shares issued and outstanding at March 31, 2023 and December 31, 2022
Common stock, $0.001 par value; 200,000,000 shares authorized, 25,014,984 shares issued and outstanding at March 31, 2023; 200,000,000 shares authorized, 24,964,502 shares issued and outstanding at December 31, 2022	25	25
Additional paid-in capital	360,701	359,508
Accumulated other comprehensive loss	(61)	(223)
Accumulated deficit	(290,821)	(277,517)
Total stockholders' equity	69,844	81,793
Total liabilities and stockholders' equity	$ 110,454	$ 123,373