Intangible Assets Other Than Goodwill (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Acquired Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	$ 31,328	$ 31,328
Accumulated Amortization	(28,536)	(28,140)
Net Amount	2,792	3,188
Trademarks	$ 300	300
Licenses
Acquired Intangible Assets by Major Class [Line Items]
Weighted Useful Lives	5 years 9 months 21 days
Gross Carrying Amount	$ 20,130	20,130
Accumulated Amortization	(20,130)	(19,988)
Net Amount	$ 0	142
Product lines
Acquired Intangible Assets by Major Class [Line Items]
Weighted Useful Lives	10 years 4 months 9 days
Gross Carrying Amount	$ 4,846	4,846
Accumulated Amortization	(2,054)	(1,800)
Net Amount	$ 2,792	3,046
Customer relationships
Acquired Intangible Assets by Major Class [Line Items]
Weighted Useful Lives	4 years 10 months 24 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	5 years
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	5 years
Gross Carrying Amount	$ 200	200
Accumulated Amortization	(200)	(200)
Net Amount	$ 0	$ 0