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Summary of Significant Accounting Policies - Schedule of fair value valuation (Details) | Dec. 31, 2018 $ / shares
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Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Expected term (in years) | 2 years
Fair value of underlying shares (in dollars per share) |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Measurement input | 19.02
Volatility |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Measurement input | 0.550
Risk-free interest rate |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Measurement input | 0.0248
Dividend yield |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Measurement input | 0

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