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Acquisitions - Quickthree Solutions, Inc. (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jun. 01, 2018 | Mar. 15, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition costs |  |  | $ 0 | $ 0 | $ 0 | $ 1,159,000
Payments to acquire assets |  | $ 15,549,000 |  |  |  |
Quickthree Solutions |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase agreement amount | $ 30,000,000 |  |  |  |  |
Consideration transferred, adjustment | $ 12,750,000 |  |  |  |  |
Adjustment period | 3 years |  |  |  |  |

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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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