Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 126,302	$ 5,963
Prepaid expenses and other current assets	3,718	345
Total current assets	130,020	6,308
Property and equipment, net	2,634	349
Other assets	825	365
Total assets	133,479	7,022
Current liabilities:
Accounts payable	2,784	527
Accrued expenses and other current liabilities	7,822	2,098
Total current liabilities	10,606	2,625
Warrant to purchase redeemable convertible preferred stock		35
Derivative liability		371
Deferred rent, net of current portion	689	126
Other long-term liability		500
Total liabilities	11,295	3,657
Commitments and contingencies (Note 14)
Redeemable convertible preferred stock (Note 8)		26,500
Stockholders' equity (deficit):
Preferred stock, $0.0001 par value; 10,000,000 shares authorized and no shares issued or outstanding as of December 31, 2018; No shares authorized, issued or outstanding at December 31, 2017
Common stock, $0.0001 par value; 150,000,000 and 51,000,000 shares authorized as of December 31, 2018 and 2017, respectively; 23,959,903 and 2,581,474 shares issued as of December 31, 2018 and 2017, respectively; 23,806,628 and 2,305,173 shares outstanding as of December 31, 2018 and 2017, respectively	2
Additional paid-in capital	193,921	339
Accumulated deficit	(71,739)	(23,474)
Total stockholders' equity (deficit)	122,184	(23,135)
Total liabilities, redeemable convertible preferred stock and stockholders' equity (deficit)	$ 133,479	$ 7,022