Fair Value Measurements - Financial Liabilities Measured at Fair Value on Recurring Basis (Detail) - Other Current Liabilities [Member] - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Carrying Value [Member]
Liabilities:
Derivative liabilities	$ 453	$ 40
Estimate of Fair Value Measurement [Member]
Liabilities:
Derivative liabilities	453	40
Significant Other Observable Inputs (Level 2) [Member]
Liabilities:
Derivative liabilities	$ 453	$ 40