Basis of Presentation - Additional Information (Detail) $ / shares in Units, $ in Millions	1 Months Ended
	Aug. 31, 2017 USD ($) $ / shares shares
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Stock issued during period, shares, new issue through private placement | shares	3,783,784
Common stock offering price | $ / shares	$ 9.25
Proceeds from net of offering expenses | $	$ 32.9