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Debt - Convertible Debt (Details) - USD ($)
1 Months Ended 12 Months Ended
Nov. 30, 2018
Apr. 30, 2018
Dec. 31, 2018
Debt Instrument [Line Items]      
Common stock acquired in exchange for warrants (in shares)     412,667
Convertible Notes Payable | Convertible Promissory Notes      
Debt Instrument [Line Items]      
Debt instrument, face amount     $ 1,000,000.0
Common stock acquired in exchange for warrants (in shares)     412,667
Debt instrument, interest rate, stated percentage     5.00%
Debt instrument, convertible, conversion price (in USD per share)     $ 7.00
Warrants and rights outstanding   $ 800,000  
Conversion of units (in shares)   118,644  
Principal and interest expense, debt $ 200,000