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Fair value measurements | 6 Months Ended
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Jun. 30, 2019
Fair Value Disclosures [Abstract] |
Fair value measurements | Note 5. Fair value measurements: During the six months ended June 30, 2019 the Company issued the Notes and Warrants in connection with the Notes. The Notes and Warrants were classified as liabilities and measured at fair value on the issuance date, with changes in fair value recognized as other expense on the consolidated statements of operations and disclosed in the unaudited condensed interim consolidated financial statements. During the three months ended June 30, 2019, in accordance with their original terms, all of the Notes were converted into a total of 1,813,500 shares of the Company’s common stock by their holders. 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
There were no assets or liabilities measured at fair value during the six months ended June 30, 2018. Unobservable inputs were used to determine the fair value of positions that the Company has classified within the Level 3 category. 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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- References No definition available. + Details
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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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