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Share-Based Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Options    
Outstanding, beginning balance 992,221  
Granted 122,500  
Exercised 0  
Cancelled (381,043)  
Outstanding, ending balance 733,678 992,221
Vested or expected to vest at September 30, 2018 733,678  
Exercisable at September 30, 2018 337,063  
Weighted Average Exercise Price    
Outstanding, beginning balance $ 10.71  
Granted 0  
Exercised 0  
Cancelled 5.31  
Outstanding, ending balance 4.67 $ 10.71
Vested or expected to vest at September 30, 2018 4.67  
Exercisable at September 30, 2018 $ 0  
Weighted Average Contractual Life (in Years)    
Outstanding at end of period 5 years 11 months 15 days 5 years 8 months 19 days
Vested or expected to vest at September 30, 2018 5 years 11 months 15 days  
Exercisable at September 30, 2018 0 years  
Aggregate Intrinsic Value    
Outstanding at end of period $ 16 $ 63
Vested or expected to vest at September 30, 2018 16  
Exercisable at September 30, 2018 $ 0