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Equity Method Investment - Carrying value (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 11 Months Ended
Oct. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jan. 31, 2018
Equity Method Investment            
Carrying value of investment   $ 7,853   $ 7,853    
Carrying value of equity method investment            
Beginning balance       7,847    
Purchases of Kleo common stock       1,375 $ 2,999  
Loss recognized in connection with equity method investment   (641) $ (348) (1,369) (566)  
Ending balance   7,853   7,853    
Kleo            
Equity Method Investment            
Carrying value of investment     5,538   2,753  
Carrying value of equity method investment            
Beginning balance         2,753  
Purchases of Kleo common stock $ 2,253     1,375 3,351 $ 5,500
Loss recognized in connection with equity method investment   $ (641) (348) $ (1,369) (566)  
Ending balance     $ 5,538   $ 5,538