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Summary of significant accounting policies - Inventory (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Inventory Write-down	$ 1,800,000.0
Raw materials	1,431,000	$ 452,000
Work in progress	9,324,000	3,912,000
Finished goods	5,362,000	6,390,000
Total inventory	$ 16,117,000	$ 10,754,000

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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