Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 98,959	$ 117,433
Marketable securities	19,889	15,106
Related party collaboration receivable	257	732
Prepaid expenses and other current assets	5,394	3,427
Total current assets	124,499	136,698
Property and equipment, net	17,857	21,920
Deposits and other non-current assets	1,515	1,779
Operating lease, right-of-use assets	15,485	33,458
Total assets	159,356	193,855
Current liabilities:
Accounts payable	2,566	574
Accrued expenses	7,816	10,950
Other current liabilities	2,832	5,571
Deferred revenue, current	59,377	33,886
Total current liabilities	72,591	50,981
Deferred revenue, non-current	6,450	8,210
Other non-current liabilities	21,295	39,609
Total liabilities	100,336	98,800
Commitments and contingencies (see note 9)
Stockholders' equity:
Preferred stock, $0.001 par value: 5,000,000 shares authorized; no shares issued and outstanding at December 31, 2022 and 2021
Common stock, $0.001 par value: 120,000,000 shares authorized; 38,613,891 and 37,918,395 shares issued and outstanding at December 31, 2022 and 2021, respectively	38	38
Additional paid-in capital	452,713	442,259
Accumulated other comprehensive loss	(219)	(138)
Accumulated deficit	(393,512)	(347,104)
Total stockholders' equity	59,020	95,055
Total liabilities and stockholders' equity	$ 159,356	$ 193,855