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Investment in equity securities, Number of Shares, Cost and Fair Value of Investment (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Investment in equity securities [Abstract]    
Number of shares (in shares) | shares 295,256 [1] 1,476,280
Cost $ 3,667 $ 3,667
Fair value $ 1,529 $ 3,656
Reverse stock split 2.16  
[1] During the nine months ended September 30, 2019, the investee effected a 5-for-1 reverse stock split.