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Business and Summary of Significant Accounting Policies - Initial Public Offering (Details) - USD ($) $ / shares in Units, $ in Millions |  | 9 Months Ended |
--- | --- | --- | ---
Jul. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Subsidiary, Sale of Stock [Line Items] |  |  |
Common stock, authorized (in shares) | 500,000,000 | 500,000,000 | 93,855,000
Preferred stock, authorized (in shares) | 10,000,000 |  |
IPO |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Stock sold, price per share (in usd per share) | $ 23.00 |  |
Net proceeds from sale of stock | $ 264.8 |  |
Common Stock |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Issuance of common stock upon conversion of redeemable convertible preferred stock (in shares) |  | 55,386,000 |
Common Stock | IPO |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Stock sold (in shares) | 12,535,000 |  |
Issuance of common stock upon conversion of redeemable convertible preferred stock (in shares) | 55,385,854 |  |
Common Stock | Over-allotment option |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Stock sold (in shares) | 1,635,000 |  |
Redeemable convertible Series A preferred stock | IPO |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Issuance of common stock upon conversion of redeemable convertible preferred stock (in shares) | 15,847,500 |  |
Redeemable convertible Series B preferred stock | IPO |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Issuance of common stock upon conversion of redeemable convertible preferred stock (in shares) | 39,538,354 |  |

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