Condensed Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 113,484	$ 153,001
Marketable securities	127,604	94,776
Accounts receivable	0	47
Prepaid expenses and other current assets (includes $0 and $285 at June 30, 2022 and December 31, 2021, respectively, attributable to related parties)	5,435	8,456
Total current assets	246,523	256,280
Marketable securities, long-term	20,532	67,652
Property and equipment, net	21,097	14,391
Operating lease right-of-use assets	13,821	14,562
Other assets	963	602
Total assets	302,936	353,487
Current liabilities
Accounts payable	3,316	4,764
Accrued and other current liabilities	6,163	7,744
Deferred revenue	2,256	2,599
Operating lease liabilities, current portion	2,596	1,231
Total current liabilities	14,331	16,338
Deferred revenue, net of current portion	1,452	2,491
Derivative liability	222	214
Long-term portion of operating lease liabilities	14,402	15,217
Other liabilities	12	120
Total liabilities	30,419	34,380
Commitments and contingencies (Note 9)
Stockholders’ equity
Common stock, $0.0001 par value, 300,000,000 shares authorized at June 30, 2022 and December 31, 2021; 32,376,878 and 32,224,524 shares issued and outstanding at June 30, 2022 and December 31, 2021, respectively	3	3
Additional paid-in-capital	535,761	526,523
Accumulated other comprehensive loss	(1,827)	(423)
Accumulated deficit	(261,420)	(206,996)
Total stockholders’ equity	272,517	319,107
Total liabilities and stockholders’ equity	$ 302,936	$ 353,487