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Acquisitions - Additional Information (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |
Fair value of the contingent consideration included in accruals and other current liabilities |  |  | $ 5,100 | $ 2,390
Contingent consideration from acquisitions | $ 3,583 |  | 5,100 | 2,390
Reclassifications to noncontingent consideration from acquisitions | (1,340) | $ 62 | 62 | 272
Other Noncurrent Liabilities [Member] |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |
Contingent consideration from acquisitions |  |  | 1,499 | 1,926
Series of Individually Immaterial Business Acquisitions |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |
Acquisition contingent consideration | 5,143 |  | 6,599 |
Fair value of the contingent consideration included in accruals and other current liabilities | 1,560 |  | 1,499 |
Contingent consideration from acquisitions | $ 3,583 |  | 5,100 |
Reclassifications to noncontingent consideration from acquisitions |  |  |  | 8,516
Fair value adjustments to reduce revenue |  |  | $ 553 | 2,469
Number of acquisitions, purchase accounting not yet finalized |  |  | 3 |
Business combination, maximum measurement period for fair value determination |  |  | 1 year |
Acquisition and integration costs |  |  | $ 950 | 1,361
Series of Individually Immaterial Business Acquisitions | Accruals and other current liabilities |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |
Acquisition contingent consideration |  |  | 6,599 | 4,316
Current deferred payment obligations |  |  | 5,999 | 11,019
Series of Individually Immaterial Business Acquisitions | Other Noncurrent Liabilities [Member] |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |
Long-term deferred payment obligations |  |  | $ 1,499 | $ 2,826

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460 + Details
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