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Stockholders' Equity - Assumed Stock Options (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 6 Months Ended
--- | --- | ---
Feb. 08, 2019 | Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Dividend yield |  | 0.00%
Weighted average grant date fair value of stock options assumed (in dollars per share) |  | $ 21.60
Fair value of options assumed in business combination |  | $ 19.4
Post combination, stock-based compensation expense |  | $ 18.6
HelloSign Inc. |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock options assumed (in shares) | 0.9 |

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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