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Common Stock - Narrative (Details) - $ / shares | 1 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 | Sep. 30, 2018 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |
Common stock authorized (in shares) |  | 19,333,333 | 19,333,333
Common stock, par value (in dollars per share) |  | $ 0.0001 | $ 0.0001
Series 1 Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Common stock authorized (in shares) |  | 6,000,000 |
Series 2 Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Increase in common stock authorized (in shares) | 555,555 |  |
Common stock authorized (in shares) |  | 13,333,333 |

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