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Organization - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Apr. 03, 2019 | Mar. 22, 2019 | Mar. 31, 2019 | Dec. 31, 2018
Common Stock, shares issued | 14,222,142 |  | 140,675,332 | 139,453,710
Secondary Offering [Member] |  |  |  |
Shares issued |  | 13,000,000 |  |
Shares issued, price per share |  | $ 50.50 |  |
Secondary Offering [Member] | Selling, General and Administrative Expense [Member] |  |  |  |
Offering costs |  |  | $ 0.9 |
Underwriter [Member] |  |  |  |
Stock option granted |  | 1,950,000 |  |
Issuance of common stock upon exercise of options, shares | 1,222,142 |  |  |

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