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v3.19.2

Stockholders' Equity - Summary of Warrant Activity (Details) - $ / shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Warrants outstanding [Roll Forward] |  |
Outstanding, beginning of period (in shares) | 65,685,269 |
Exercised (in shares) | (4,119,500) |
Outstanding, end of period (in shares) | 61,565,769 | 65,685,269
Warrants, Exercise Price per Share [Roll Forward] |  |
Outstanding, (in dollars per share) | $ 0.23 | $ 0.22
Warrants, Weighted Average Exercise Price [Roll Forward] |  |
Outstanding, beginning of period (in dollars per share) | 0.22 |
Exercised (in dollars per share) | 0.01 |
Outstanding, end of period (in dollars per share) | $ 0.23 | $ 0.22
Weighted average remaining life | 5 years 5 months 26 days | 5 years 9 months
Minimum [Member] |  |
Warrants, Exercise Price per Share [Roll Forward] |  |
Outstanding, (in dollars per share) | $ 0.01 | $ 0.01
Maximum [Member] |  |
Warrants, Exercise Price per Share [Roll Forward] |  |
Outstanding, (in dollars per share) | $ 10.00 | $ 10.00

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- Definition Weighted average remaining contractual term for each class of warrants or rights outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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