Intangible Assets (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Acquired Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	$ 60,340	$ 60,340
Accumulated Amortization	(46,596)	(43,028)
Net Amount	13,744	17,312
Trademarks	$ 300	300
Licenses
Acquired Intangible Assets by Major Class [Line Items]
Weighted Useful Lives	2120 days
Gross Carrying Amount	$ 20,130	20,130
Accumulated Amortization	(19,846)	(19,383)
Net Amount	$ 284	747
Product lines
Acquired Intangible Assets by Major Class [Line Items]
Weighted Useful Lives	3781 days
Gross Carrying Amount	$ 33,858	33,858
Accumulated Amortization	(20,398)	(17,293)
Net Amount	$ 13,460	16,565
Customer relationships
Acquired Intangible Assets by Major Class [Line Items]
Weighted Useful Lives	1788 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	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	1825 days
Gross Carrying Amount	$ 200	200
Accumulated Amortization	(200)	(200)
Net Amount	$ 0	$ 0