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Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 68,114 $ 68,116
Accumulated Amortization (30,936) (24,404)
Accumulated Impairment Loss (19,258) (19,258)
Total $ 17,920 $ 24,454
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 (1,907) (1,769)
Accumulated Impairment Loss (4,179) (4,179)
Total $ 1,014 $ 1,152
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 (5,268) (4,704)
Accumulated Impairment Loss (4,328) (4,328)
Total $ 3,004 $ 3,568
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 (16,542) (14,681)
Accumulated Impairment Loss (10,751) (10,751)
Total $ 6,207 $ 8,068
Distribution Rights    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful lives of intangibles 3 years 3 years
Gross Carrying Amount $ 7,500 $ 7,500
Accumulated Amortization (4,341) (1,356)
Accumulated Impairment Loss 0 0
Total $ 3,159 $ 6,144
Patents    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful lives of intangibles 8 years 8 years
Gross Carrying Amount $ 6,796 $ 6,798
Accumulated Amortization (2,334) (1,504)
Accumulated Impairment Loss 0 0
Total $ 4,462 $ 5,294
Other Intangible Assets    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful lives of intangibles 2 years 2 years
Gross Carrying Amount $ 618 $ 618
Accumulated Amortization (544) (390)
Accumulated Impairment Loss 0 0
Total $ 74 $ 228