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Loss Per Share - Two Class Method (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Loss Per Share        
Net loss   $ (10,581)   $ (20,350)
Less: preferred dividends   (1,892)   (5,548)
Net loss attributable to common stockholders $ (8,979) $ (12,473) $ (170,094) $ (25,898)
Denominator:        
Weighted average common shares outstanding (in shares) 58,736 14,085 58,638 13,873
Loss per common share - basic and diluted under two-class method (in dollars per share)   $ (0.89)   $ (1.87)
Preferred dividends $ 0   $ 0