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Retirement plan (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
United States
Defined Contribution Plan Disclosure [Line Items]
Employer contributions to retirement plan	$ 43,866	$ 31,308	$ 33,422
Canada
Defined Contribution Plan Disclosure [Line Items]
Employer contributions to retirement plan	$ 25,900	$ 26,578	$ 21,777

X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

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X

- Definition

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+ References

No definition available.

+ Details

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