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Correction (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Total classification changes required related to these adjustments
Accounts receivable allowances	$ 48	$ 452
Accounts receivable	5,742	2,958
Unbilled services	(8,666)	(8,672)
Net cash used in operating activities	$ (56,567)	(40,539)
As previously reported
Total classification changes required related to these adjustments
Accounts receivable allowances		174
Accounts receivable		3,435
Unbilled services		(8,871)
Net cash used in operating activities		$ (40,539)

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The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.

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The increase (decrease) during the reporting period of the amount of revenue for work performed for which billing has not occurred, net of uncollectible accounts.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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