Stockholders' Equity - Series A Convertible Preferred Stock - Additional Information (Detail) - shares	1 Months Ended	12 Months Ended
	Jan. 31, 2014	Dec. 31, 2016	Dec. 31, 2015
Equity [Abstract]
Convertible preferred stock	33,334
Converted preferred stock	33,334
Preferred stock converted into shares		8.00%
Convertible preferred stock outstanding		0	0