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Fair value measurements (Tables) | 6 Months Ended
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Jun. 30, 2019
Fair Value Disclosures [Abstract] |
Schedule of Weighted Average Unobservable Inputs | A summary of weighted average (in aggregate) significant unobservable inputs (Level 3 inputs) used in measuring the Company’s Notes and Warrants at the issuance date of January 28, 2019 and during the conversion of the Notes for the three months ended June 30, 2019, are as follows: Senior Secured Promissory Notes:
| January 28, 2019 |  | Three months ended June 30, 2019
| (Unaudited) |  | (Unaudited)
Dividend yield | 0% |  | 0%
Expected price volatility | 119.5% |  | 122.2%-127.1%
Risk free interest rate | 2.60% |  | 2.07%-2.44%
Expected term | 1 year |  | -
Warrants:
| January 28, 2019 |  | Three months ended June 30, 2019
| (Unaudited) |  | (Unaudited)
Dividend yield | 0% |  | 0%
Expected price volatility | 111.6% |  | 119.9%-120.5%
Risk free interest rate | 2.58% |  | 2.23%-2.58%
Expected term | 5 years |  | 4 years, 10 months
Schedule of Changes in Level 3 Liabilities Measured at Fair Value | The following table presents changes in Level 3 liabilities measured at fair value for the six months ended June 30, 2019.
|  | Convertible Notes |  | Warrant Liability
Issuance of senior secured convertible notes |  | $ | 6,330,726 |  |  | $ | — |
Issuance of warrants in connection with convertible notes |  |  | — |  |  |  | 2,568,934 |
Balance at January 28, 2019 |  |  | 6,330,726 |  |  |  | 2,568,934 |
Change in fair value |  |  | 1,644,582 |  |  |  | 2,753,228 |
Balance at March 31, 2019 |  |  | 7,975,307 |  |  |  | 5,322,162 |
Change in fair value |  |  | 2,250,651 |  |  |  | 116,498 |
Conversion of convertible notes to common stock |  |  | (10,225,959 | ) |  |  | — |
Recalssification of warrant liability to equity |  |  | — |  |  |  | (5,438,660 | )
Balance at June 30, 2019 |  | $ | — |  |  | $ | —

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) using recurring unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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