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Summary of significant accounting policies (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
subsidiary
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
segment
subsidiary
customer
Dec. 31, 2017
USD ($)
customer
Dec. 31, 2016
USD ($)
customer
Summary of significant accounting policies                      
Number of operating segments | segment                 1    
Concentration of credit risk                      
Allowance for doubtful accounts $ 0       $ 0       $ 0 $ 0  
Impairment of long-lived assets                      
Impairment charges                 0 0 $ 0
Disaggregation of revenue                      
Revenues 15,393 $ 12,503 $ 11,363 $ 10,729 $ 9,222 $ 7,100 $ 5,179 $ 5,631 $ 49,988 27,132 10,033
Product returns                      
Return time period for expired product prior to expiry date                 6 months    
Return time period for expired product after expiry date                 12 years    
Return period of Tusioness product (in years)                 3 years    
Advertising costs                      
Advertising costs                 $ 600 $ 400 $ 7,400
Income taxes                      
Deferred tax assets, net of valuation allowance $ 0               $ 0    
Accounts Receivable | Customer Concentration Risk                      
Concentration of credit risk                      
Concentration Risk, Number | customer                 14 14  
Accounts Receivable | Customer Concentration Risk | Major Customers                      
Concentration of credit risk                      
Concentration Risk, Number | customer                 3 3  
Concentration Risk, Percentage                 96.00% 94.00%  
Revenues And Deferred Revenues | Customer Concentration Risk                      
Concentration of credit risk                      
Concentration Risk, Number | customer                 15 14 13
Revenues And Deferred Revenues | Customer Concentration Risk | Major Customers                      
Concentration of credit risk                      
Concentration Risk, Number | customer                 3 3 2
Concentration Risk, Percentage                 93.00% 93.00% 82.00%
Adzenys XR-ODT                      
Disaggregation of revenue                      
Revenues                 $ 26,631 $ 20,377 $ 3,803
Cotempla XR-ODT                      
Intangible assets                      
Useful life                   15 years  
Disaggregation of revenue                      
Revenues                 19,014 $ 1,590  
Adzenys ER                      
Intangible assets                      
Useful life                   15 years  
Disaggregation of revenue                      
Revenues                 (27)    
Generic Tussionex                      
Intangible assets                      
Useful life                   10 years  
Disaggregation of revenue                      
Revenues                 $ 4,370 $ 5,165 $ 6,230
Minimum                      
Property and equipment                      
Property and equipment - Useful life                 3 years    
Intangible assets                      
Useful life                 10 years    
Maximum                      
Property and equipment                      
Property and equipment - Useful life                 10 years    
Intangible assets                      
Useful life                 20 years    
Wholly-owned subsidiaries                      
Summary of significant accounting policies                      
Number of wholly-owned subsidiaries | subsidiary 4               4