Net Loss Per Share - Additional Information (Detail)		6 Months Ended
	Aug. 15, 2016 shares	Jun. 30, 2017 shares	Dec. 31, 2016 shares
Earnings Per Share [Abstract]
Reverse stock split ratio	0.25
Common stock, shares authorized	100,000,000	100,000,000	100,000,000
Reverse stock split, effective date	Aug. 17, 2016
Reverse stock split, description		Common stock at a ratio of one (1) share for every four (4) shares outstanding, so that every four (4) outstanding shares of common stock before the Reverse Split represents one (1) share of common stock after the Reverse Split.