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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Dec. 30, 2017 | Jul. 01, 2017 | Dec. 31, 2016
Restricted cash | $ 1,100 | $ 2,800 |  |
Carrying value of convertible promissory note | 14,200 | 14,100 |  |
Estimated fair value of convertible promissory note | 12,000 | 12,300 |  |
Impairment of long-lived assets | $ 0 |  |  |
ASU 2016-18 |  |  |  |
Restricted cash |  | $ 2,800 | $ 3,100 | $ 3,100

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