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Winfrey Transaction - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands			3 Months Ended	12 Months Ended
	Oct. 19, 2015	Oct. 18, 2015	Jan. 02, 2016	Dec. 31, 2016	Jan. 02, 2016
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Aggregate purchase price					$ 41,475
Options exercisable price per share				$ 12.49
Stock option expense			$ 12,759
Share based compensation ,dividend yield	0.00%			0.00%	0.00%
Share based compensation ,volatility	63.88%				41.00%
Share based compensation ,risk free rate	1.36%
Prior To Third Anniversary
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percentage of options shares to be transferred	40.00%
Prior To Fourth Anniversary
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percentage of options shares to be transferred	60.00%
Prior To Fifth Anniversary
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percentage of options shares to be transferred	80.00%
Prior To Second Anniversary
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percentage of options shares to be transferred	20.00%
Option
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Common stocks to be purchased through options	3,513		3,513		3,513
Options exercisable price per share	$ 6.97
Strategic Collaboration Agreement
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Initial term of agreement		5 years
Additional renewal terms		1 year
Share Purchase Agreement
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Purchased shares	6,362
Purchased shares, price per share	$ 6.79
Aggregate purchase price	$ 43,199
Fees related to share issuance	2,315
Fees related to share issuance, reduction of equity	$ 1,700
Share transfer restriction period	2 years
Minimum percentage of voting power transfer for change of control	50.00%
Share Purchase Agreement | Prior To Third Anniversary | Maximum
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percentage of shares transferable	15.00%
Share Purchase Agreement | Prior To Fourth Anniversary | Maximum
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percentage of shares transferable	30.00%
Share Purchase Agreement | Prior To Fifth Anniversary | Maximum
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percentage of shares transferable	60.00%
Share Purchase Agreement | Right of first offer, the "Securities Act" | Minimum
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percentage of Company's issued and outstanding Common Stock proposed for transfer	1.00%
Share Purchase Agreement | Right of first refusal, Competitor of the Company | Minimum
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percentage of Company's issued and outstanding Common Stock proposed for transfer	1.00%
Share Purchase Agreement | Right of first refusal | Minimum
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percentage of Company's issued and outstanding Common Stock proposed for transfer	5.00%

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Amount of decrease in additional paid in capital (APIC) resulting from direct costs associated with issuing stock. Includes, but is not limited to, legal and accounting fees and direct costs associated with stock issues under a shelf registration.

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