Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 173,415	$ 57,937
Short-term investments	555,231	130,333
Receivable from collaboration partners ($943 and $0 from a related party)	1,049	132
Accrued interest receivable	649	251
Prepaid expenses and other current assets	5,471	4,052
Total current assets	735,815	192,705
Long-term investments	6,440
Property and equipment, net	10,807	9,330
Right-of-use assets	12,781
Restricted cash	203	203
Other long-term assets	6,246	872
Total assets	772,292	203,110
Current liabilities:
Accounts payable	15,682	4,704
Accrued research and development expenses	18,307	4,572
Other accrued liabilities	9,543	4,950
Deferred revenue, current ($67,571 and $0 to a related party)	74,571	7,000
Other current liabilities	3,566	1,480
Total current liabilities	121,669	22,706
Deferred revenue, noncurrent ($117,808 and $0 to a related party)	122,830	12,022
Operating lease liabilities, noncurrent	15,243
Deferred rent, non-current		3,734
Other long-term liabilities ($9,703 and $0 to a related party)	10,246	806
Total liabilities	269,988	39,268
Commitments (Note 12)
Stockholders’ equity:
Preferred stock, $0.0001 par value, 10,000,000 shares authorized as of December 31, 2020 and 2019; no shares issued and outstanding as of December 31, 2020 and 2019	0	0
Common stock, $0.0001 par value, 400,000,000 shares authorized as of December 31, 2020 and 2019; 65,114,685 and 45,925,004 shares issued and outstanding as of December 31, 2020 and 2019, respectively	6	4
Additional paid-in capital	830,438	369,100
Accumulated deficit	(328,184)	(205,326)
Accumulated other comprehensive income	44	64
Total stockholders’ equity	502,304	163,842
Total liabilities and stockholders’ equity	$ 772,292	$ 203,110