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Summary of significant accounting policies (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
subsidiary
Sep. 30, 2018
USD ($)
subsidiary
Sep. 30, 2019
USD ($)
segment
subsidiary
Sep. 30, 2018
USD ($)
subsidiary
Dec. 31, 2018
USD ($)
Summary of significant accounting policies          
Number of operating segments | segment     1    
Disaggregation of revenue          
Revenues $ 17,540 $ 12,503 $ 47,817 $ 34,595  
Product returns          
Return time period for expired product prior to expiry date     6 months    
Return time period for expired product after expiry date     12 months    
Advertising costs          
Advertising costs 0 200 $ 0 600  
Income taxes          
Deferred tax assets, net of valuation allowance 0   0   $ 0
Adzenys XR-ODT          
Disaggregation of revenue          
Revenues 8,794 6,995 22,692 18,503  
Cotempla XR-ODT          
Disaggregation of revenue          
Revenues 7,227 4,884 19,513 12,873  
Adzenys ER          
Disaggregation of revenue          
Revenues 232 31 563 206  
Generic Tussionex          
Disaggregation of revenue          
Revenues $ 1,287 $ 593 $ 5,049 $ 3,013  
Minimum          
Intangible assets          
Useful life     10 years    
Maximum          
Intangible assets          
Useful life     20 years    
Wholly-owned subsidiaries          
Summary of significant accounting policies          
Number of wholly-owned subsidiaries | subsidiary 4 4 4 4