Subsequent Events - Additional Information (Details) - Subsequent Event - USD ($) $ / shares in Units, $ in Millions	Apr. 26, 2019	Apr. 12, 2019	Apr. 01, 2019
Common Stock, PreferredStock, DebtSecurities, Warrants And Units | Maximum
Subsequent Event [Line Items]
Proceeds through future financings			$ 350.0
At-The-Market Sales Agreement | Maximum
Subsequent Event [Line Items]
Proceeds through future financings			$ 100.0
Follow-on Offering | Common Stock
Subsequent Event [Line Items]
Shares issued and sold		5,555,556
Shares issued price per share		$ 22.50
Net proceeds after deducting underwriting discounts and commissions		$ 117.5
Underwriters Option | Common Stock
Subsequent Event [Line Items]
Shares issued and sold	833,333
Shares issued price per share	$ 22.50
Net proceeds after deducting underwriting discounts and commissions	$ 17.6