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Finance lease liability - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of finance lease and operating lease by lessee [line items]    
Imputed interest rate 7.35%  
Finance lease liability $ 5,695,000 $ 6,881,000
Deferred gain on finance lease liability 2,566,000 2,982,000
Building lease    
Disclosure of finance lease and operating lease by lessee [line items]    
Finance lease liability 5,695,000 6,829,000
Machinery lease    
Disclosure of finance lease and operating lease by lessee [line items]    
Finance lease liability $ 0 $ 52,000