Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current Assets
Cash and cash equivalents	$ 166,144	$ 114,504
Investments	34,894
Prepaid expenses and other current assets	5,434	2,721
Total current assets	206,472	117,225
Property and equipment, net	4,740	4,143
Deposits and other	1,506	316
Total assets	212,718	121,684
Current Liabilities
Accounts payable	2,757	1,307
Accrued expenses	4,519	3,008
Other current liabilities	264	247
Total current liabilities	7,540	4,562
Capital lease obligations, net of current portion	65	100
Deferred rent	118	6
Preferred stock warrant liability		380
Total liabilities	7,723	5,048
Stockholders’ equity (deficit)
Additional paid-in capital	348,942	3,593
Accumulated other comprehensive income (loss)	43	(4)
Accumulated deficit	(143,993)	(96,622)
Total stockholders’ equity (deficit)	204,995	(93,033)
Total liabilities and stockholders’ equity	212,718	121,684
Series A convertible preferred stock
Current Liabilities
Convertible preferred stock		55,030
Series B convertible preferred stock
Current Liabilities
Convertible preferred stock		34,333
Series C1 convertible preferred stock
Current Liabilities
Convertible preferred stock		65,691
Series C2 convertible preferred stock
Current Liabilities
Convertible preferred stock		$ 54,615
Class A common stock
Stockholders’ equity (deficit)
Common stock	2
Class B common stock
Stockholders’ equity (deficit)
Common stock	$ 1