Convertible Preferred Stock and Stockholders' Equity - Additional Information (Details) - Subsequent Event	Apr. 02, 2018 USD ($) $ / shares shares
Temporary Equity [Line Items]
Convertible preferred shares converted to common stock | shares	24,168,656
Initial Public Offering
Temporary Equity [Line Items]
Sale of common stock in initial public offering | $	$ 10,350,000
Offering price | $ / shares	$ 16.00
Net proceeds from initial public offering after underwriting discounts and commissions and offering expenses | $	$ 151,000,000
Convertible preferred shares converted to common stock | shares	24,168,656