- Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Acquired Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	$ 60,340	$ 60,340
Accumulated Amortization	(43,028)	(38,150)
Net Amount	17,312	22,190
Trademarks, net	$ 300	300
Licenses
Acquired Intangible Assets by Major Class [Line Items]
Weighted Useful Lives (Years)	2121 days
Gross Carrying Amount	$ 20,130	20,130
Accumulated Amortization	(19,383)	(18,620)
Net Amount	$ 747	1,510
Product lines
Acquired Intangible Assets by Major Class [Line Items]
Weighted Useful Lives (Years)	3781 days
Gross Carrying Amount	$ 33,858	33,858
Accumulated Amortization	(17,293)	(13,178)
Net Amount	$ 16,565	20,680
Customer relationships
Acquired Intangible Assets by Major Class [Line Items]
Weighted Useful Lives (Years)	1789 days
Gross Carrying Amount	$ 3,152	3,152
Accumulated Amortization	(3,152)	(3,152)
Net Amount	$ 0	0
Trade names
Acquired Intangible Assets by Major Class [Line Items]
Weighted Useful Lives (Years)	1825 days
Gross Carrying Amount	$ 3,000	3,000
Accumulated Amortization	(3,000)	(3,000)
Net Amount	$ 0	0
Non-compete agreements
Acquired Intangible Assets by Major Class [Line Items]
Weighted Useful Lives (Years)	1825 days
Gross Carrying Amount	$ 200	200
Accumulated Amortization	(200)	(200)
Net Amount	$ 0	$ 0