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v3.19.2

Fair value measurements (Schedule of Changes in Level 3 Liabilities Measured at Fair Value) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2019 | Jun. 30, 2018
Conversion of convertible notes to common stock | $ (10,225,959) |  | $ (10,225,959) |
Recalssification of warrant liability to equity |  |  | 5,438,660 |
Convertible Notes [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Issuance of senior secured convertible notes |  | $ 6,330,726 |  |
Issuance of warrants in connection with convertible notes |  |  |  |
Balance Beginning | 7,975,907 | 6,330,726 | 6,330,726 |
Change in fair value | 2,250,651 | 1,644,582 |  |
Conversion of convertible notes to common stock | (10,225,959) |  |  |
Recalssification of warrant liability to equity |  |  |  |
Balance Ending |  | 7,975,907 |  |
Warrant [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Issuance of senior secured convertible notes |  |  |  |
Issuance of warrants in connection with convertible notes |  | 2,568,934 |  |
Balance Beginning | 5,322,162 | 2,568,934 | 2,568,934 |
Change in fair value | 116,498 | 2,753,228 |  |
Conversion of convertible notes to common stock |  |  |  |
Recalssification of warrant liability to equity | (5,438,660) |  |  |
Balance Ending |  | $ 5,322,162 |  |

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- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
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- Definition Fair value of financial and nonfinancial obligations. + 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 (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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- Definition The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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