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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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- Definition

Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

+ References

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+ References

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