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Savant Arrangements (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended
Jun. 30, 2016
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2017
Aggregate cost overages       $ 3,400
Net of duductible       500
Due to Savant   $ 2,000 $ 2,000 2,000
Savant Neglected Diseases, LLC [Member]        
Number of shares called by warrant 200,000 100,000    
Exercise price of warrant $ 2.25 $ 2.25    
Exercise period of warrant 5 years      
Aggregate cost overages   $ 2,100    
Due to Savant   $ 4,100    
Due from Savant       $ 1,400
Savant Neglected Diseases, LLC [Member] | Exercisable Immediately [Member]        
Percentage of warrants exercisable 25.00%