Convertible Preferred Stock - Additional Information (Details) - USD ($) $ in Thousands		2 Months Ended	6 Months Ended
	Jul. 20, 2018	Mar. 31, 2018	Jun. 30, 2018	Jan. 01, 2018
Temporary Equity [Line Items]
Net proceeds from issuance of convertible preferred stock			$ 63,266
Convertible preferred stock, issuance costs			$ 660
Series A Convertible Preferred Stock
Temporary Equity [Line Items]
Convertible preferred,Shares Outstanding				28,763,179
Series A and B Convertible Preferred Stock | Initial Public Offering
Temporary Equity [Line Items]
Stock issued upon conversion of convertible securities	14,712,571
Series B Convertible Preferred Stock
Temporary Equity [Line Items]
Convertible preferred stock, shares issued		19,641,200
Net proceeds from issuance of convertible preferred stock		$ 63,500
Convertible preferred stock, issuance costs		$ 200