The Company and Basis of Presentation - Additional Information (Detail) - Follow on Offering [Member] - USD ($) $ / shares in Units, $ in Millions	Feb. 21, 2017	Feb. 14, 2017
Class of Stock [Line Items]
Stock issued, shares	2,347,636	19,500,000
Shares issued, price per share		$ 1.35
Proceeds from issuance of common stock, net of deferred financing costs		$ 27.4
Underwriting discounts and commissions and offering expenses		$ 2.1