Summary of Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Summary Of Significant Accounting Policies [Line Items]
Due period for credit sales	90 days
Long-lived assets for impairment	$ 0
Deferred Tax assets	0	$ 0
Deferred Tax liabilities	$ 0	$ 0
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives	5 years
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives	7 years