Summary of Significant Accounting Policies - Revised Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue
Product and license									$ 156,057	$ 218,908	$ 182,556
Service and Other									36,247	22,535	18,981
Total Revenue	$ 47,597	$ 43,648	$ 54,293	$ 46,767	$ 50,889	$ 60,027	$ 65,393	$ 65,135	192,304	241,443	201,537
Cost of goods sold
Product and License									53,191	95,028	72,802
Service and Other									8,456	2,875	3,093
Total Cost of Goods Sold									61,647	97,903	75,895
Gross profit	31,954	30,050	36,551	32,104	33,000	35,695	37,739	37,106	130,657	143,540	125,642
Operating costs
Sales and marketing									57,347	38,199	42,189
Research and development									23,214	17,457	18,546
General and administrative									31,648	32,489	22,287
Amortization of purchased intangibles									8,849	4,942	4,532
Total operating costs	29,765	29,138	33,165	28,990	27,832	22,240	21,986	21,030	121,058	93,087	87,554
Operating income	$ 2,186	$ 912	$ 3,386	$ 3,115	$ 5,168	$ 13,455	$ 15,753	$ 16,077	$ 9,599	50,453	38,088
As Previously Reported [Member]
Revenue
Total Revenue										241,443	201,537
Cost of goods sold
Total Cost of Goods Sold										95,351	73,771
Gross profit										146,092	127,766
Operating costs
Sales and marketing										39,670	43,362
Research and development										18,538	19,497
General and administrative										32,489	22,287
Amortization of purchased intangibles										4,942	4,532
Total operating costs										95,639	89,678
Operating income										50,453	38,088
Adjustment [Member]
Revenue
Product and license										218,908	182,556
Service and Other										22,535	18,981
Cost of goods sold
Product and License										95,028	72,802
Service and Other										2,875	3,093
Total Cost of Goods Sold										2,552	2,124
Gross profit										(2,552)	(2,124)
Operating costs
Sales and marketing										(1,471)	(1,173)
Research and development										(1,081)	(951)
General and administrative										0
Amortization of purchased intangibles										0
Total operating costs										(2,552)	$ (2,124)
Operating income										$ 0