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Equity Method Investment - Roll-forward of Carrying Value (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Carrying value of equity method investment        
Beginning balance     $ 11,414 $ 7,847
Purchases of Kleo common stock     0 1,375
Loss recognized in connection with equity method investment $ (1,993) $ (697) (4,308) (2,066)
Ending balance $ 7,106 $ 7,156 $ 7,106 $ 7,156