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The Company, Fair Value Measurements (Details) - Level 3 [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Roll Forward]    
Beginning balance $ 0 $ 3
Increase (decrease) in fair value 0 (1)
Ending balance 0 2
October 31, 2013 - Warrants [Member]    
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Roll Forward]    
Beginning balance 0 2
Increase (decrease) in fair value 0 (1)
Ending balance $ 0 1
February 5, 2014 - Warrants [Member]    
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Roll Forward]    
Beginning balance   1
Increase (decrease) in fair value   0
Ending balance   $ 1