Consolidated Balance Sheets - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 34,605,000	$ 154,666,000
Investments	280,462,000	0
Prepaid expenses and other current assets	4,487,000	1,048,000
Total current assets	319,554,000	155,714,000
Property and equipment, net	385,000	164,000
Restricted cash	1,223,000	55,000
Deferred offering costs	0	2,303,000
Right-of-use asset	8,402,000
Other non-current assets	106,000	59,000
Total assets	329,670,000	158,295,000
Current liabilities:
Accounts payable	2,538,000	1,964,000
Accrued expenses and other current liabilities	11,680,000	2,899,000
Total current liabilities	14,218,000	4,863,000
Derivative liabilities	0	16,000
Non-current operating lease liability	7,694,000
Total liabilities	21,912,000	4,879,000
Commitments and contingencies (Note 12)	0	0
Convertible preferred stock (series A, B and C); $0.0001 par value; 64,871,795 shares authorized at December 31, 2019; 64,839,353 shares issued and outstanding at December 31, 2019; aggregate liquidation preference of $194,727 at December 31, 2019	0	200,573,000
Stockholders' equity (deficit):
Preferred stock, $0.0001 par value; 10,000,000 shares and no shares authorized at December 31, 2020 and 2019, respectively; no shares issued or outstanding at December 31, 2020 and 2019	0	0
Common stock; $0.0001 par value; 500,000,000 shares authorized at December 31, 2020 and 80,000,000 shares authorized at December 31, 2019; 36,078,383 shares issued and outstanding at December 31, 2020 and 2,236,672 shares issued and outstanding at December 31, 2019	5,000	1,000
Additional paid-in capital	425,363,000	3,812,000
Accumulated other comprehensive income	614,000	0
Accumulated deficit	(118,224,000)	(50,970,000)
Total stockholders' equity (deficit)	307,758,000	(47,157,000)
Total liabilities, convertible preferred stock and stockholders' equity (deficit)	$ 329,670,000	$ 158,295,000