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Nature of Operations and Business Activities (Detail Textuals) - USD ($) | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Oct. 05, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Nature Of Operations And Business Activities [Line Items] |  |  |  |  |  |
Accumulated deficit | $ 47,999,499 | $ 33,225,107 |  |  | $ 14,030,871 |
Stockholders' deficit | 27,864,191 | 15,562,252 |  | $ 5,753,979 | 3,569,506 | $ 2,914,235
Working capital deficit | 23,989,664 | 13,985,284 |  |  |  |
Cash and cash equivalents | 4,412,952 | 1,853,373 |  | $ 2,945,312 | $ 259,955 |
Aggregate gross proceeds |  | 900,000 |  |  |  |
Emerald Financing Warrant Liability |  |  |  |  |  |
Nature Of Operations And Business Activities [Line Items] |  |  |  |  |  |
Amount of cash inflow from convertible debt - related party | $ 4,000,000 | 3,250,000 |  |  |  |
Aggregate gross proceeds |  | $ 400,000 |  |  |  |
Emerald Financing Warrant Liability | Multi-Draw Credit Agreement |  |  |  |  |  |
Nature Of Operations And Business Activities [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 20,000,000 |  |  |
Principal amounts of borrowing capacity |  |  | $ 250,000 |  |  |

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- Definition Short-Term financing which is expected to be paid back relatively quickly, such as by a subsequent longer-term loan. Also called swing loan or bridge financing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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