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Stockholders' Equity - Schedule of Common Stock Reserved for Future Issuance (Parenthetical) (Details) - Common Stock - shares | 3 Months Ended | 5 Months Ended | 9 Months Ended | 14 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2018
Class Of Stock [Line Items] |  |  |  |
Stock repurchase, shares |  | 135,000 |  |
Share Repurchase Program August 2017 |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Stock repurchase, shares | 42,995 |  | 193,523 | 328,523

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