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Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 68,116 $ 59,516
Accumulated Amortization (24,404) (19,304)
Accumulated Impairment Loss (19,258) (19,258)
Total $ 24,454 $ 20,954
Trademarks    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful lives of intangibles 15 years 15 years
Gross Carrying Amount $ 7,100 $ 7,100
Accumulated Amortization (1,769) (1,631)
Accumulated Impairment Loss (4,179) (4,179)
Total $ 1,152 $ 1,290
Existing technology    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful lives of intangibles 13 years 13 years
Gross Carrying Amount $ 12,600 $ 12,600
Accumulated Amortization (4,704) (4,141)
Accumulated Impairment Loss (4,328) (4,328)
Total $ 3,568 $ 4,131
Customer Relationships    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful lives of intangibles 11 years 11 years
Gross Carrying Amount $ 33,500 $ 33,500
Accumulated Amortization (14,681) (12,819)
Accumulated Impairment Loss (10,751) (10,751)
Total $ 8,068 $ 9,930
Distribution Rights    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful lives of intangibles 3 years  
Gross Carrying Amount $ 7,500  
Accumulated Amortization (1,356)  
Accumulated Impairment Loss 0  
Total $ 6,144  
Patents    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful lives of intangibles 8 years 8 years
Gross Carrying Amount $ 6,798 $ 6,316
Accumulated Amortization (1,504) (713)
Accumulated Impairment Loss 0 0
Total $ 5,294 $ 5,603
Other Intangible Assets    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful lives of intangibles 2 years  
Gross Carrying Amount $ 618  
Accumulated Amortization (390)  
Accumulated Impairment Loss 0  
Total $ 228