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Equity - Preferred Stock (Details) - $ / shares
Mar. 31, 2019
Dec. 31, 2018
Class of Stock [Line Items]    
Par value (in dollars per share) $ 0.001 $ 0.001
Shares authorized (in shares) 20,000,000 20,000,000
Series A shares issued and outstanding    
Class of Stock [Line Items]    
Shares issued (in shares) 6,375 6,375
Shares outstanding (in shares) 6,375 6,375
Series A-2 shares issued and outstanding    
Class of Stock [Line Items]    
Shares issued (in shares) 4,000 14,000
Shares outstanding (in shares) 4,000 14,000