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Mezzanine and Stockholders' Equity - Stock Option Activity Under Black-Scholes Option (Details)
6 Months Ended
Jun. 30, 2019
$ / shares
Stockholders' Equity Note [Abstract]  
Expected Term 3 years
Expected volatility 100.27%
Risk-free interest rate 2.51%
Market value of common stock (in dollars per share) $ 18.11
Annual dividend yield 0.00%
Forfeiture rate 0.00%