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Fair Value Measurements - Schedule of warrant derivative liabilities (Details) | Mar. 31, 2020 Integer | Dec. 31, 2019 Integer
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Expected Life [Member] | Strome Warrants [Member] |  |
Warrants term | 3 years 2 months 16 days | 3 years 5 months 12 days
Expected Life [Member] | B. Riley Warrants [Member] |  |
Warrants term | 5 years 6 months 18 days | 5 years 9 months 18 days
Measurement Input, Risk Free Interest Rate [Member] | Strome Warrants [Member] |  |
Warrants measurement input | 0.29 | 1.62
Measurement Input, Risk Free Interest Rate [Member] | B. Riley Warrants [Member] |  |
Warrants measurement input | 0.46 | 1.76
Volatility Factor [Member] | Strome Warrants [Member] |  |
Warrants measurement input | 128.74 | 144.54
Volatility Factor [Member] | B. Riley Warrants [Member] |  |
Warrants measurement input | 129.92 | 127.63
Dividend Rate [Member] | Strome Warrants [Member] |  |
Warrants measurement input | 0 | 0
Dividend Rate [Member] | B. Riley Warrants [Member] |  |
Warrants measurement input | 0 | 0
Transaction Date Closing Market Price [Member] | Strome Warrants [Member] |  |
Warrants measurement input | 0.77 | 0.80
Transaction Date Closing Market Price [Member] | B. Riley Warrants [Member] |  |
Warrants measurement input | 0.77 | 0.80
Exercise Price [Member] | Strome Warrants [Member] |  |
Warrants measurement input | 0.50 | 0.50
Exercise Price [Member] | B. Riley Warrants [Member] |  |
Warrants measurement input | 1.00 | 1.00

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- Definition Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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