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General - Net loss per share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Jul. 12, 2017
Mar. 31, 2018
Mar. 31, 2017
Net loss per share      
Net loss attributable to common stockholders   $ (24,908) $ (15,681)
Weighted average common shares outstanding - basic and diluted   152,140,117 64,024,557
Loss per share - Basic and diluted   $ (1.64) $ (2.45)
Series A Preferred Stock      
Net loss per share      
Number of anti-dilutive shares excluded from computation of diluted loss per share   5,586,344  
Warrants      
Net loss per share      
Number of anti-dilutive shares excluded from computation of diluted loss per share 35,000,000