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Principal Business Activity and Significant Accounting Policies - Receivables and Credit Policy (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Receivables and Credit Policy    
Accounts receivable, gross $ 51,631 $ 22,486
Less: Allowance for doubtful accounts (400) (343)
Non-current portion of receivables 321 384
Total accounts receivable, net 50,910 21,759
Trade receivables    
Receivables and Credit Policy    
Accounts receivable, gross 48,449 22,189
Notes receivable    
Receivables and Credit Policy    
Accounts receivable, gross $ 3,182 $ 297