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v3.19.1

Summary of Significant Accounting Policies - Share-Based Compensation (Details) - $ / shares | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |
Number of days prior to the grant that common stock and restricted stock units fair value is determined based on | 3 days |
Class A |  |
Class of Stock [Line Items] |  |
Common stock, par value (in dollars per share) | $ 0.00001 | $ 0.00001

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