Stockholders' Equity - Additional Information (Detail) - USD ($)		12 Months Ended
	May 11, 2015	Dec. 31, 2015	Dec. 31, 2016	Jun. 02, 2016	Jun. 01, 2016
Stockholders Equity [Line Items]
Authorized shares of capital stock			303,000,000		203,000,000
Common stock, par value		$ 0.01	$ 0.01		$ 0.01
Common stock, shares authorized		200,000,000	300,000,000	300,000,000
Proceeds from issuance of common stock, net		$ 42,850,677
Underwritten Public Offering [Member]
Stockholders Equity [Line Items]
Issuance of common stock, shares	23,000,000
Common stock price per shares	$ 2.00
Proceeds from issuance of common stock, net	$ 42,900,000