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Business Combinations - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jan. 31, 2020 | Sep. 30, 2019 | Mar. 31, 2020
Business Acquisition [Line Items] |  |  |
Consideration holdback period | 18 months |  |
Repayments of notes payable |  |  | $ 0.2
Class A common stock |  |  |
Business Acquisition [Line Items] |  |  |
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares) |  | 31,381,152 |
Class B common stock |  |  |
Business Acquisition [Line Items] |  |  |
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares) |  | 134,276,690 |
Conversion of Class B Common Stock To Class A Common Stock | Former Employees | Class A common stock |  |  |
Business Acquisition [Line Items] |  |  |
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares) |  | 15,198,587 |
Conversion of Class B Common Stock To Class A Common Stock | Former Employees | Class B common stock |  |  |
Business Acquisition [Line Items] |  |  |
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares) |  | 15,198,587 |
S2 Systems Corporation |  |  |
Business Acquisition [Line Items] |  |  |
Consideration transferred | $ 16.9 |  |
Cash payments to acquire businesses | 13.6 |  |
Cash acquired | 0.1 |  |
Value of shares issued | 1.1 |  |
Payments to settle acquiree's outstanding debt | 6.9 |  |
Consideration held back | 2.2 |  |
Compensation arrangements value | 21.1 |  |
Compensation arrangement with individual, compensation expense | $ 6.5 |  | 1.4
Compensation arrangement with individual, recorded liability |  |  | $ 13.2
Compensation arrangement, weighted-average remaining recognition period |  |  | 3 years

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477 + Details
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