Subsequent Events - Additional Information (Details) - Subsequent Event $ / shares in Units, $ in Millions	Apr. 02, 2018 USD ($) $ / shares shares
Subsequent Event [Line Items]
Net proceeds from initial public offering | $	$ 151.0
Convertible preferred shares converted to common stock	24,168,656
Initial Public Offering
Subsequent Event [Line Items]
Common stock shares issued	10,350,000
Offering price per share | $ / shares	$ 16.00
Convertible preferred shares converted to common stock	24,168,656