CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 56,451	$ 36,455
Available-for-sale securities	69,198	112,292
Accounts receivable from related party	10,000	11,402
Prepaid expenses and other current assets	5,757	4,042
Total current assets	141,406	164,191
Available-for-sale securities, long-term		13,547
Property and equipment, net	4,867	5,611
Right-of-use asset, operating	10,707
Right-of-use asset, finance	134
Other assets	1,164	1,128
Total assets	158,278	184,477
Current liabilities:
Accounts payable	1,915	4,012
Accrued expenses and other current liabilities	8,186	7,712
Deferred collaboration liability, current	9,123	8,118
Deferred rent and lease incentive obligation, current		696
Operating lease liability, current	3,523
Finance lease liability, current	127
Total current liabilities	22,874	20,538
Long-term liabilities:
Deferred collaboration liability, long term	10,204	16,431
Deferred rent and lease incentive obligation, long term		4,208
Operating lease liability, long term	11,727
Other long-term liabilities	1,615	1,611
Total liabilities	46,420	42,788
Commitments and contingencies (Note 7)
Stockholders' equity:
Preferred stock, $0.001 par value; 5,000,000 shares authorized, no shares issued and outstanding at June 30, 2022 and December 31, 2021
Common stock, $0.001 par value; 200,000,000 shares authorized, 24,964,502 shares issued and 24,959,848 shares outstanding at June 30, 2022; 200,000,000 shares authorized, 24,964,520 shares issued and 24,951,983 shares outstanding at December 31, 2021	25	25
Additional paid-in capital	357,995	356,308
Accumulated other comprehensive loss	(588)	(132)
Accumulated deficit	(245,574)	(214,512)
Total stockholders' equity	111,858	141,689
Total liabilities and stockholders' equity	$ 158,278	$ 184,477