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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 07, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock under public offering, net of issuance costs			$ 136,566	$ 215,756
ATM Agreement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock issuable and sellable under offering agreement			75,000		$ 75,000
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock under public offering, net of issuance costs	$ 12,700	$ 14,200	$ 127	$ 142
Public offering price of common stock issued (in USD per share)	$ 11.50	$ 16.25
Net proceeds from issuance of common stock, after deducting offering expenses	$ 136,300	$ 215,800

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