BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 157,898	$ 7,013
Short-term investments	177,551	32,074
Prepaid expenses and other current assets	10,190	3,355
Total current assets	345,639	42,442
Property and equipment, net	3,000	2,437
Other assets	349	90
Total assets	348,988	44,969
Current liabilities:
Accounts payable	1,754	3,051
Accrued expenses	7,352	4,039
Deferred revenue - related party	7,728	12,894
Total current liabilities	16,834	19,984
Deferred revenue - related party net of current portion	21,306	9,571
Deferred rent	987	898
Total liabilities	39,127	30,453
Commitments and contingencies (Note 6)
Stockholders’ equity (deficit):
Common stock; $0.0001 par value: 300,000,000 shares authorized, 41,779,183 and 7,632,777 shares issued and 41,767,431 and 7,600,877 shares outstanding at December 31, 2020 and 2019, respectively	5	1
Additional paid-in capital	382,012	887
Accumulated other comprehensive income (loss)	(63)	54
Accumulated deficit	(72,093)	(35,490)
Total stockholders’ equity (deficit)	309,861	(34,548)
Total liabilities, redeemable convertible preferred stock and stockholders’ equity (deficit)	348,988	44,969
Series A Redeemable Convertible Preferred Stock
Temporary Equity [Abstract]
Redeemable convertible preferred stock	0	49,064
Series B Redeemable Convertible Preferred Stock
Temporary Equity [Abstract]
Redeemable convertible preferred stock	0	0
Series B-1 Redeemable Convertible Preferred Stock
Temporary Equity [Abstract]
Redeemable convertible preferred stock	$ 0	$ 0