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Warrants - Summary of Warrant Activity (Details) - Warrant [Member] - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Number of Warrants Issued, Warrants outstanding, Beginning Balance | 3,058,402 | 1,487,958
Number of Warrants Issued, Warrants issued | 190,114 | 9,231,628
Number of Warrants Issued, Warrants exercised |  | (7,617,147)
Number of Warrants Issued, Warrants cancelled in exchange for common stock | (1,641,427) |
Number of Warrants Issued, Warrants expired | (13,927) | (44,037)
Number of Warrants Issued, Warrants outstanding and exercisable, Ending Balance | 1,593,162 | 3,058,402
Weighted Average Exercise Price, Warrants outstanding, Beginning Balance | $ 5.29 | $ 9.39
Weighted Average Exercise Price, Warrants issued | 2.63 | 3.46
Weighted Average Exercise Price, Warrants exercised |  | 2.89
Weighted Average Exercise Price, Warrants cancelled in exchange for common stock | 3.04 |
Weighted Average Exercise Price, Warrants expired | 226.24 | 209.23
Weighted Average Exercise Price, Warrants outstanding and exercisable, Ending Balance | $ 5.36 | $ 5.29
Aggregate intrinsic value of outstanding warrants |  |
Weighted average remaining contractual terms (years) | 1 year 10 months 14 days |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options. + References No definition available. + Details
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