Subsequent Event- Additional Information (Detail) - shares		Mar. 15, 2017	Dec. 31, 2016	Dec. 31, 2015
Subsequent Event [Line Items]
Common stock, authorized shares	[1]		30,000,000	30,000,000
Subsequent Event | Minimum
Subsequent Event [Line Items]
Common stock, authorized shares		10,000,000
Subsequent Event | Maximum
Subsequent Event [Line Items]
Common stock, authorized shares		30,000,000

[1] On March 15, 2017, the Company's shareholders voted to increase the authorized shares. Refer to Note 26.