Derivative liabilities - Summary of derivative liability balance (Details) - USD ($)	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Fair Value Change	$ (274,235)	$ 2,857,244
Notes
Beginning Balance	1,406,209
Initial Derivative Liability	411,247
Fair Value Change	153,540
Derivative Settlement	(356,295)
Ending Balance	1,614,701
Warrants
Beginning Balance	155,022
Initial Derivative Liability	78,029
Fair Value Change	(119,690)
Derivative Settlement
Ending Balance	113,361
Totals
Beginning Balance	1,561,231
Initial Derivative Liability	489,276
Fair Value Change	33,850
Derivative Settlement	(356,295)
Ending Balance	$ 1,728,062

Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
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- Definition

The amount of cash received during the period on settlement of a hedge.

+ References

No definition available.

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
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