Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
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Net Loss Per Share (Details) - shares	3 Months Ended		6 Months Ended
Net Loss Per Share (Details) - shares	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018	May 31, 2018	May 29, 2018
Common stock \| Maximum
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Warrants to purchase aggregate shares of common stock					5,400,000	5,400,000
2009 Stock Plans
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common shares (in shares)	8,000,000	7,300,000	8,000,000	7,300,000