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Summary of significant accounting policies - Transactions with Affiliate (Details) - Purification Cellutions LLC	Dec. 31, 2017	Dec. 31, 2016	May 15, 2016	Dec. 31, 2015
Related Party Transaction [Line Items]
Noncontrolling interest ownership percentage	30.00%	30.00%	30.00%	30.00%
Percentage of earnings included in calculation of provision for income taxes	70.00%

X

- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Details

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