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Convertible Notes Financing - Additional Information (Details) - Convertible Promissory Note - USD ($) | Jan. 04, 2018 | Oct. 02, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |
Amount of issued |  | $ 6,000,000
Interest rate |  | 8.00%
Maturity date |  | Oct. 02, 2018
Amount to be raised by automatic conversion of the Note upon qualified equity financing |  | $ 40,000,000
Series A Convertible Preferred Stock |  |
Debt Instrument [Line Items] |  |
Number of shares issued for conversion of the Note | 3,499,209 |

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