Income (Loss) Per Share - Anti-dilutive Securities (Detail) - $ / shares		3 Months Ended
		Mar. 31, 2017	Apr. 01, 2016	Dec. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive equity awards outstanding		8,574,000	7,379,000
Potential Common Shares Upon Notes Conversion If Only Settled In Shares		22,304,348
Debt Instrument, Convertible, Conversion Price		$ 5.75		$ 5.75
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive equity awards outstanding		4,892,000	5,548,000
Restricted Stock Units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive equity awards outstanding		2,707,000	1,772,000
Employee Stock Purchase Plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive equity awards outstanding		193,000	59,000
Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive equity awards outstanding	[1]	782,000	0

[1] On September 26, 2016, in connection with the execution of a product supply agreement pursuant to which an affiliate of Comcast Corporation (together with Comcast Corporation, “Comcast”) may, in its sole discretion, purchase from the Company licenses to certain of the Company’s software products, the Company granted Comcast a warrant to purchase shares of its common stock. (See Note 15, “Warrants” for additional information).