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Revenues - Contract Assets and Liabilities under Topic 606 (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 27, 2019
Sep. 28, 2018
Sep. 27, 2019
Sep. 28, 2018
Dec. 28, 2018
Revenue from Contract with Customer [Abstract]          
Unbilled collaboration revenue $ 0   $ 0   $ 0
Deferred revenue 15,399   15,399   $ 15,897 [1]
Amount of revenues recognized included in the beginning contract liability balance     2,700 $ 6,100  
Revenues recognized for performance obligations satisfied in previous periods $ 67,700 $ 48,200 $ 129,000 $ 151,800  
[1]
The Condensed Consolidated Balance Sheet as of December 31, 2018 has been derived from the audited financial statements as of that date.