Employee Benefit Plans and Stock-based Compensation - Summary of Company's Stock Option and Restricted Stock Unit Activity (Detail) shares in Thousands		3 Months Ended	9 Months Ended
		Sep. 29, 2017 $ / shares shares	Sep. 29, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Available for Grant, Beginning balance			3,912
Shares Available for Grant, Authorized			7,400
Shares Available for Grant, Granted	[1]		(4,446)
Shares Available for Grant, Forfeited or cancelled	[1]		2,490
Shares Available for Grant, Ending balance		9,356	9,356
Below FMV Grants Decrease in Plan Reserve Shares Ratio			1.5
Below FMV Grants Forfeiture Increase in Plan Reserve Shares Ratio			1.5
Restricted Stock Units Outstanding [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Units, Beginning balance			3,864
Shares Available for Grant, Authorized			0
Number of Units, Granted	[1]		2,943
Number of Units, exercised			0
Number of Units, Shares released			(2,244)
Number of Units, Forfeited or cancelled	[1]		(1,182)
Number of Units, Ending balance		3,381	3,381
Weighted Average Grant Date Fair Value, Beginning balance | $ / shares			$ 4.26
Weighted Average Grant Date Fair Value, Authorized | $ / shares			0
Estimated weighted average fair value per share at purchase date | $ / shares	[1]		5.40
Weighted Average Grant Date Fair Value, Exercised | $ / shares			0
Weighted Average Grant Date Fair Value, Shares released | $ / shares			4.12
Weighted Average Grant Date Fair Value, Forfeited or cancelled | $ / shares	[1]		5.05
Weighted Average Grant Date Fair Value, Ending balance | $ / shares		$ 5.04	$ 5.04
Stock Options Outstanding [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Available for Grant, Authorized			0
Number of Shares, Beginning balance			5,019
Number of Shares, Granted	[1]	0	30
Number of Shares, Options exercised			(97)
Number of Shares, Forfeited or cancelled	[1]		(717)
Number of Shares, Ending balance		4,235	4,235
Weighted Average Exercise Price, Beginning balance | $ / shares			$ 6.01
Weighted Average Exercise Price, Authorized | $ / shares			0
Weighted Average Exercise Price, Granted | $ / shares	[1]		5.10
Weighted Average Exercise Price, Options exercised | $ / shares			3.03
Weighted Average Exercise Price, Forfeited or cancelled | $ / shares	[1]		5.95
Weighted Average Exercise Price, Ending balance | $ / shares		$ 6.09	$ 6.09

[1] Grants of RSUs and any non-statutory stock options issued at prices less than the fair market value on the date of grant decrease the plan reserve 1.5 shares for every unit or share granted and any forfeitures of these awards due to their not vesting would increase the plan reserve by 1.5 shares for every unit or share forfeited.