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Fair Value of Financial Instruments (Details) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 28, 2019 | Dec. 29, 2018 | Sep. 28, 2019 | Dec. 29, 2018
Fair Value of Financial Instruments |  |  |  |
Maximum period of additional purchase consideration to be paid | 4 years |  |  |
Money market mutual funds |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Fair value per share of CRA's money market mutual fund share holdings |  |  |  | $ 1.00
Recurring | Level 1 |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Total Assets |  |  | $ 149 | $ 18,029
Recurring | Level 1 | Money market mutual funds |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Cash and cash equivalents |  |  | 149 | 18,029
Recurring | Level 3 |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Contingent consideration liability | $ 6,197 | $ 5,137 | 9,632 | 6,197
Total Liabilities |  |  | $ 9,632 | $ 6,197
Summary of changes in contingent consideration liabilities |  |  |  |
Beginning balance | 6,197 | 5,137 |  |
Remeasurement of acquisition-related contingent consideration | 1,868 | (244) |  |
Accretion | 1,567 | 1,304 |  |
Ending balance | $ 9,632 | $ 6,197 |  |

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