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, 2019	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 31, 2018		Sep. 28, 2018		Jun. 29, 2018		Mar. 30, 2018		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator:
Net loss	$ 5,570	$ 11,657	$ (11,845)	$ (11,306)	$ 3,330	[1],[2]	$ (7,758)	[1],[2]	$ (2,913)	[1],[2]	$ (13,694)	[1],[2]	$ (5,924)	$ (21,035)	$ (82,955)
Denominator:
Basic and diluted													89,575	85,615	80,974
Net loss per share, Basic and diluted
Basic and diluted					$ 0.04		$ (0.09)		$ (0.03)		$ (0.16)		$ (0.07)	$ (0.25)	$ (1.02)

[1] During the fourth quarter of 2019, the Company recorded a one-time benefit of approximately $2.0 million due to changes in the Company's global tax structure. In addition, the Company recorded a one-time benefit of approximately $0.8 million due to a valuation allowance release for one of its foreign subsidiaries due to changes in forecasted taxable income resulting from the Company receiving a favorable tax ruling during the first quarter of 2019. During the fourth quarter of 2018, the Company released $1.0 million of valuation allowance associated with one of Company’s foreign subsidiaries.

[2] During the third and the fourth quarter of 2019, the Company recorded net income primarily due to growing success of our Cable OS solution and with stronger gross margins due to increase in revenue from Software. During the fourth quarter of 2018, the Company recorded net income primarily due to higher revenues with stronger gross margins of 53.1% coupled with reduced operating expenses as a result of our vigilant cost management.