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Business Combinations - Additional Information (Details) $ in Thousands, shares in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) clientList shares | Mar. 31, 2020 USD ($) clientList shares | Dec. 31, 2020 USD ($)
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash | $ 1,900 | $ 9,400 |
Contingent consideration | 1,600 | 4,800 |
Contingent consideration arrangements - High | 1,700 | 6,200 |
Aggregate fair value of contingent consideration | 1,600 | 4,700 |
Contingent consideration, current | 22,767 |  | $ 20,288
Contingent consideration, non-current | 31,463 |  | $ 34,103
Annual revenue | 3,600 | 6,100 |
Consideration paid in common stock |  | 900 |
Goodwill | 1,500 | 11,200 |
Business combination contingent consideration liability other adjustments based on projected future results of acquisition | 700 | (700) |
Consideration paid in cash | $ 1,500 | $ 2,400 |
Number of common stock issued (in shares) | shares | 0.1 | 0.1 |
Contingent Purchase Price Liability – Current |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Contingent consideration, current | $ 600 | $ 2,000 |
Contingent Purchase Price Liability – Non-current |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Contingent consideration, non-current | 1,000 | 2,700 |
Acquisition of Client Lists |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash | 200 | 500 |
Contingent consideration | $ 100 | $ 300 |
Acquisition of Client Lists | Benefits and Insurance Services Practice Group |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Number of client list purchased | clientList | 1 | 2 |
Previous Client List Purchases |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash | $ 100 | $ 300 |

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