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Nature of the Business and Liquidity (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
product
segment
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Business Combination Segment Allocation [Line Items]        
Operating segments | segment 1      
Cash and cash equivalents | $ $ 26,692 $ 66,006 $ 87,191 $ 158,883
US        
Business Combination Segment Allocation [Line Items]        
Generic products marketed 25      
Branded generic products marketed 4      
CANADA        
Business Combination Segment Allocation [Line Items]        
Generic and branded generic products marketed 30