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v3.19.2

Fair value measurements (Schedule of Weighted Average Unobservable Inputs) (Details) - Fair Value, Inputs, Level 3 [Member] | 1 Months Ended | 3 Months Ended
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Jan. 28, 2019 | Jun. 30, 2019
Dividend yield [Member] | Warrant [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Weighted Average Unobservable Inputs | 0% | 0%
Expected Price volatility [Member] | Warrant [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Weighted Average Unobservable Inputs | 111.6% | 119.9%-120.5%
Risk free interest rate [Member] | Warrant [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Weighted Average Unobservable Inputs | 2.58% | 2.23%-2.58%
Expected term [Member] | Warrant [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Weighted Average Unobservable Inputs | 5 years | 4 years, 10 months
Senior Secured Convertible Promissory Notes [Member] | Dividend yield [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Weighted Average Unobservable Inputs | 0% | 0.00
Senior Secured Convertible Promissory Notes [Member] | Expected Price volatility [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Weighted Average Unobservable Inputs | 119.5% | 122.2%-127.1%
Senior Secured Convertible Promissory Notes [Member] | Risk free interest rate [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Weighted Average Unobservable Inputs | 2.60% | 2.07%-2.44%
Senior Secured Convertible Promissory Notes [Member] | Expected term [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Weighted Average Unobservable Inputs | 1 year |

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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. + References No definition available. + Details
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- Definition Description of the valuation processes in place for fair value measurements categorized within Level 3 of the fair value hierarchy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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