Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Disclosure - Goodwill and Intangible Assets - Additional Information (Detail) [Line Items]
Goodwill	$ 20,626,000	$ 20,626,000	$ 24,041,000
Goodwill, Impairment	$ 0	$ 0	0
Identifiable intangible assets, weighted average life		15 years
Patent rights [Member]
Disclosure - Goodwill and Intangible Assets - Additional Information (Detail) [Line Items]
Estimated useful life of intangible asset		19 years
Amortization expense		$ 5,000	5,000
Acquired technology [Member]
Disclosure - Goodwill and Intangible Assets - Additional Information (Detail) [Line Items]
Estimated useful life of intangible asset		19 years
Amortization expense		$ 176,000	176,000
Customer relationships [Member]
Disclosure - Goodwill and Intangible Assets - Additional Information (Detail) [Line Items]
Estimated useful life of intangible asset		5 years
Amortization expense		$ 264,000	$ 264,000