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Preferred Stock and Common Stock Warrants - Assumptions (Details) - Common Stock Warrants
12 Months Ended
Dec. 31, 2018
$ / shares
Class of Warrant or Right [Line Items]  
Stock price $ 5.40
Exercise price $ 0.01
Risk-free rate 2.50%
Volatility 33.10%
Term (years) 2 years 8 months 12 days