Net Income (Loss) Per Share - Numerators and Denominators of Basic and Diluted Net Income (Loss) Per Share Computations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended														12 Months Ended
	Dec. 31, 2015	[1]	Oct. 02, 2015	[2]	Jul. 03, 2015	Apr. 03, 2015	[3]	Dec. 31, 2014	[1]	Sep. 26, 2014	[1],[2]	Jun. 27, 2014	[1]	Mar. 28, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Numerator:
Income (loss) from continuing operations															$ (15,661)	$ (46,248)	$ 21,589
Income (loss) from discontinued operations															0	0	15,438
Net income (loss)	$ (7,199)		$ (4,811)		$ (994)	$ (2,657)		$ (4,854)		$ 1,078		$ (37,062)		$ (5,410)	$ (15,661)	$ (46,248)	$ 37,027
Denominator:
Basic	84,932		87,991		88,426	88,655		88,012		90,618		93,966		97,921	87,514	92,508	106,529
Effect of dilutive securities from stock options, restricted stock units and ESPP															0	0	1,279
Diluted (in shares)	84,932		87,991		88,426	88,655		88,012		91,800		93,966		97,921	87,514	92,508	107,808
Basic net income (loss) per share from:
Continuing operations, basic (usd per share)															$ (0.18)	$ (0.50)	$ 0.20
Discontinued operations, basic (usd per share)															0.00	0.00	0.14
Net income (loss) per share - basic	$ (0.08)		$ (0.05)		$ (0.01)	$ (0.03)		$ (0.06)		$ 0.01		$ (0.39)		$ (0.06)	(0.18)	(0.50)	0.35
Diluted net income (loss) per share from:
Continuing operations, diluted (usd per share)															(0.18)	(0.50)	0.20
Discontinued operations, diluted (usd per share)															0.00	0.00	0.14
Net income (loss) per share - diluted	$ (0.08)		$ (0.05)		$ (0.01)	$ (0.03)		$ (0.06)		$ 0.01		$ (0.39)		$ (0.06)	$ (0.18)	$ (0.50)	$ 0.34

[1] A history of operating losses in recent years has led to uncertainty with respect to the Company’s ability to realize certain net deferred tax assets, and as a result, the Company recorded increased valuation allowances of $24.5 million, $4.2 million and $0.3 million, in the second, third and fourth quarters of fiscal 2014, respectively, against its U.S. net deferred tax assets. In 2015, the Company continued to record a valuation allowance against all of its U.S. net deferred tax assets, resulting in an increase in valuation allowance of $3.1 million in the fourth quarter of fiscal 2015. This increase in valuation allowance is offset partially by the release of $0.9 million valuation allowance against one of its Israel subsidiaries due to cumulative income generated in recent years.

[2] In the third quarter of fiscal 2015 and 2014, the Company recorded tax benefits of $0.5 million and $9.0 million, respectively, resulting from the expiration of the applicable statute of limitations relating to the tax audits in the U.S. for the years of 2011 and 2010, respectively.

[3] In the first quarter of fiscal 2015, the Company recorded an impairment charge of $2.5 million for its investment in VJU iTV Development GmbH as a result of its assessment that this investment was impaired on an other-than-temporary basis (See Note 5, “Investments in Other Equity Securities,” of the notes to our Consolidated Financial Statements for additional information).