Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Total revenue	$ 15,729	$ 13,974	$ 52,871	$ 39,758
Fixed-Price Revenue
Total revenue	10,863	5,334	28,785	14,418
Time-and-Material Revenue
Total revenue	$ 4,866	$ 8,640	$ 24,086	$ 25,340

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details