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Restricted Stock Units and Performance Stock Units Activity (Detail) - Restricted Stock Units (RSUs) and Performance Stock Units (PSUs) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Number of Units    
Outstanding, beginning balance 392,659  
Granted 0  
Exercised 0  
Cancelled (142,659)  
Outstanding, ending balance 250,000 392,659
Weighted Average Contractual Life (in years)    
Outstanding at end of period 7 years 5 months 23 days 8 years 3 months 7 days
Aggregate Intrinsic Value    
Outstanding Aggregate Intrinsic Value $ 208 $ 429