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Operating leases (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Total operating lease, right of use asset	$ 2,051,985		$ 2,169,158
Current portion of operating lease obligations	452,617		477,147
Non-current portion of operating lease obligations	1,362,066		1,491,507
Total operating lease obligations	1,814,683		1,968,654
Total foreign exchange gain on operating leases	(36,799)	$ 0
Operating Lease [Member]
Total operating lease, right of use asset	2,051,985		$ 2,169,158
Total foreign exchange gain on operating leases	$ (36,799)	$ 0

X

- Definition

Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 20
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X

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
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X

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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X

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

+ References

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X

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

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-Publisher FASB
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-SubTopic 20
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X

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