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Fair Value of Financial Instruments (Details) - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 27, 2020 | Dec. 28, 2019 | Jun. 27, 2020 | Dec. 28, 2019
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 |  |  | $ 150 | $ 150
Recurring | Level 1 | Money market mutual funds |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Cash and cash equivalents |  |  | 150 | 150
Recurring | Level 3 |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Contingent consideration liability | $ 11,579 | $ 6,197 | 12,575 | 11,579
Total Liabilities |  |  | $ 12,575 | $ 11,579
Summary of changes in contingent consideration liability |  |  |  |
Beginning balance | 11,579 | 6,197 |  |
Remeasurement of acquisition-related contingent consideration | 448 | 3,285 |  |
Accretion | 548 | 2,097 |  |
Ending balance | $ 12,575 | $ 11,579 |  |

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