Condensed Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 397,048	$ 58,976
Prepaid expenses and other current assets	3,787	2,747
Total current assets	400,835	61,723
Property and equipment, net	2,539	3,391
Other assets	442	584
Total assets	403,816	65,698
Current liabilities:
Accounts payable	10,685	3,376
Accrued compensation	1,490	414
Accrued manufacturing expenses	24,540	5,777
Accrued expenses (including related party accrual of $134 and $15 as of September 30, 2020 and December 31, 2019, respectively)	2,870	1,305
Deferred rent — current portion	27	19
Lease liability — current portion		161
Total current liabilities	39,612	11,052
Deferred rent — long-term portion	1	17
Redeemable convertible preferred stock warrant liability		450
Other liabilities	128	242
Total liabilities	39,741	11,761
Commitments and contingencies (Note 5)
Redeemable Convertible Preferred Stock
Redeemable convertible preferred stock value		160,310
Stockholders' Equity (Deficit)
Preferred stock, $0.001 par value — 10,000,000 and no shares authorized at September 30, 2020 and December 31, 2019, respectively; no shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively
Common stock, $0.001 par value — 500,000,000 and 52,000,000 shares authorized at September 30, 2020 and December 31, 2019, respectively; 50,949,490 and 4,059,909 shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively	54	7
Additional paid-in capital	541,848	2,967
Accumulated deficit	(177,827)	(109,347)
Total stockholders' equity (deficit)	364,075	(106,373)
Total liabilities, redeemable convertible preferred stock and stockholders' equity (deficit)	$ 403,816	65,698
Series A Redeemable Convertible Preferred Stock
Redeemable Convertible Preferred Stock
Redeemable convertible preferred stock value		24,967
Series B Redeemable Convertible Preferred Stock
Redeemable Convertible Preferred Stock
Redeemable convertible preferred stock value		55,151
Series C Redeemable Convertible Preferred Stock
Redeemable Convertible Preferred Stock
Redeemable convertible preferred stock value		$ 80,192