Defined Contribution Plan - Note 13 - Additional Information (Detail) - USD ($)
$ in Thousands
|12 Months Ended|
Dec. 31, 2016
Dec. 31, 2015
|Compensation and Retirement Disclosure [Abstract]|
|Defined Contribution Plan, Employer Discretionary Contribution Amount||$ 200||$ 300|
Amount of discretionary contributions made by an employer to a defined contribution plan.
No definition available.