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Marketable Securities and Fair Value Measurements - Assumptions Used to Estimate Fair Value of Common Stock Warrants (Details)
Jun. 30, 2018
$ / shares
Risk-free interest rate  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Warranty liability 0.0232
Expected volatility  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Warranty liability 0.43
Expected Term  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Warrants, expected life in years 2 months 12 days
Dividend yield  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Warranty liability 0