Stockholders' Equity - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Class Of Stock [Line Items]
Common stock, capital shares reserved for future issuance	16,846,151
Series A Convertible Preferred Stock [Member]
Class Of Stock [Line Items]
Preferred Stock, shares authorized	1,000,000	1,000,000
Preferred stock dividends issued	0
Dividends in arrears	$ 8
Preferred Stock [Member]
Class Of Stock [Line Items]
Preferred Stock, shares authorized	50,000,000