Balance Sheets (unaudited) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 366,828	$ 158,874
Prepaid expenses	2,921	156
Prepaid research and development	12,340	6,745
Total current assets	382,089	165,775
Property and equipment, net	1,137	1,087
Other assets	9,201	11,751
Total assets	392,427	178,613
Current liabilities:
Accounts payable	2,532	629
Accrued expenses and other current liabilities	2,696	3,052
Total current liabilities	5,228	3,681
Deferred rent	489	504
Other liabilities	44	76
Total liabilities	5,761	4,261
Convertible preferred stock, $0.0001 par value:
Total convertible preferred stock		230,605
Commitments (note 7)
Stockholders’ equity (deficit):
Common stock, $0.0001 par value: 300,000,000 shares authorized; 45,797,195 shares issued and 45,350,687 shares outstanding at March 31, 2020 and 5,194,518 shares issued and 4,293,039 shares outstanding at December 31, 2019	4
Additional paid‑in capital	462,910	2,410
Accumulated deficit	(76,248)	(58,663)
Total stockholders’ equity (deficit)	386,666	(56,253)
Total liabilities, convertible preferred stock and stockholders’ equity (deficit)	$ 392,427	178,613
Series A-1 Convertible Preferred Stock
Convertible preferred stock, $0.0001 par value:
Total convertible preferred stock		74,397
Series A-2 Convertible Preferred Stock
Convertible preferred stock, $0.0001 par value:
Total convertible preferred stock		46,311
Series B Convertible Preferred Stock
Convertible preferred stock, $0.0001 par value:
Total convertible preferred stock		$ 109,897