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Stockholders' Equity - ESPP (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Jan. 01, 2018	Apr. 03, 2014
Share-based Compensation Arrangement by Share-based Payment Award
Shares of common stock reserved for future issuance (in shares)	14,764,000
ESPP
Share-based Compensation Arrangement by Share-based Payment Award
Maximum employee subscription rate, percentage of pre-tax earnings	15.00%
Purchase price of shares, percentage of the fair market value of the Company's common stock	85.00%
Maximum number of shares per employee per purchase period	1,500
Shares of common stock reserved for future issuance (in shares)	1,371,000		880,000
Automatic annual increase in common stock reserved for issuance, percentage	1.00%
Maximum annual increase of shares reserved	1,000,000
Issuance of common stock under ESPP, shares	265,172
Weighted-average price per share	$ 15.47
ESPP | Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award
Shares of common stock reserved for future issuance, additional shares		566,316

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Aggregate number of common shares reserved for future issuance.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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The highest quantity of shares an employee can purchase under the plan per period.

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The weighted average of per share prices paid for shares purchased on the open market for issuance to employees under the plan.

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