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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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