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Business Combinations - Preliminary Allocation of the Purchase Price to the Assets Acquired and the Liabilities Assumed By the Company (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Oct. 01, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 499,309 |  | $ 336,539 | $ 335,887
340B Link Business |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Accounts receivable and unbilled receivables |  | $ 8,197 |  |
Prepaid expenses |  | 232 |  |
Other current assets |  | 22,747 |  |
Total current assets |  | 31,176 |  |
Property and equipment |  | 531 |  |
Operating lease right-of-use assets |  | 3,138 |  |
Goodwill |  | 161,117 |  |
Intangible assets |  | 62,800 |  |
Total assets |  | 258,762 |  |
Accounts payable |  | 568 |  |
Accrued liabilities |  | 23,787 |  |
Long-term deferred tax liabilities |  | 6,818 |  |
Long-term operating lease liabilities |  | 2,589 |  |
Total liabilities |  | 33,762 |  |
Total purchase price |  | $ 225,000 |  |

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