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Warrants and Derivative Liabilities (Details 2) - USD ($) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 01, 2017 | Feb. 16, 2018 | Jan. 19, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Fair Value Of Derivative Liabilities [Roll Forward] |  |  |  |  |  |  |
Fair Value of Derivative Liabilities |  |  | $ 823,037 | $ 15,958,366 | $ 823,037 | $ 823,037 | $ 1,231,129
Fair Value of Derivative Liabilities Issued |  |  |  | 516,058 | 10,784,634 | 10,988,736 | 368,364
Change in Fair value of Derivative Liabilities |  |  |  | 12,820,618 | (977,493) | 6,503,174 | (767,198)
Reclassification of Derivatives to Equity |  |  |  | 0 | (2,040,706) | (2,356,581) | (9,258)
Fair Value of Derivative Liabilities |  |  |  | 29,295,042 | 8,589,472 | 15,958,366 | 823,037
Less, noncurrent portion of derivative liabilities |  |  |  | (963,369) |  | (219,453) | (551,322)
Current balance of derivative liabilities |  |  |  | 28,331,673 | 8,589,472 | 15,738,913 | 271,715
Series B Preferred Stock Conversion Liability |  |  |  |  |  |  |
Fair Value Of Derivative Liabilities [Roll Forward] |  |  |  |  |  |  |
Fair Value of Derivative Liabilities |  |  | 6,715 | 0 | 6,715 | 6,715 | 118,821
Fair Value of Derivative Liabilities Issued |  |  |  |  | 0 | 0 | 0
Change in Fair value of Derivative Liabilities |  |  |  |  | 0 | 0 | (102,848)
Reclassification of Derivatives to Equity |  |  |  |  | (6,715) | (6,715) | (9,258)
Fair Value of Derivative Liabilities |  |  |  |  | 0 | 0 | 6,715
Series F Preferred Stock Put Option Liability |  |  |  |  |  |  |
Fair Value Of Derivative Liabilities [Roll Forward] |  |  |  |  |  |  |
Fair Value of Derivative Liabilities |  |  | 0 |  | 0 | 0 | 0
Fair Value of Derivative Liabilities Issued | $ 103,364 |  |  |  |  |  | 103,364
Change in Fair value of Derivative Liabilities |  |  |  |  |  |  | (103,364)
Reclassification of Derivatives to Equity |  |  |  |  |  |  | 0
Fair Value of Derivative Liabilities |  |  |  |  |  |  | 0
Series B - warrant liability |  |  |  |  |  |  |
Fair Value Of Derivative Liabilities [Roll Forward] |  |  |  |  |  |  |
Fair Value of Derivative Liabilities |  |  | 551,322 | 487,500 | 551,322 | 551,322 | 1,112,308
Fair Value of Derivative Liabilities Issued |  |  |  | 0 | 0 | 0 | 0
Change in Fair value of Derivative Liabilities |  |  |  | 353,438 | 1,156,107 | 1,476,044 | (560,986)
Reclassification of Derivatives to Equity |  |  |  | 0 | (1,223,991) | (1,539,866) | 0
Fair Value of Derivative Liabilities |  |  |  | 840,938 | 483,438 | 487,500 | 551,322
Emerald Multi-Draw Credit Agreement - compound derivative liability |  |  |  |  |  |  |
Fair Value Of Derivative Liabilities [Roll Forward] |  |  |  |  |  |  |
Fair Value of Derivative Liabilities |  |  | 0 | 219,453 | 0 | 0 |
Fair Value of Derivative Liabilities Issued |  |  |  |  |  | 204,102 |
Fair value of derivative liabilities issued in connection with debt and equity instruments |  |  |  | 516,058 |  |  |
Change in Fair value of Derivative Liabilities |  |  |  |  |  | 15,351 |
Fair value of compound derivative |  |  |  | 227,858 |  |  |
Reclassification of Derivatives to Equity |  |  |  | 0 |  | 0 |
Fair Value of Derivative Liabilities |  |  |  | 963,369 |  | 219,453 | 0
Emerald Convertible Promissory Note - conversion liability |  |  |  |  |  |  |
Fair Value Of Derivative Liabilities [Roll Forward] |  |  |  |  |  |  |
Fair Value of Derivative Liabilities |  |  | 265,000 | 0 | 265,000 | 265,000 | 0
Fair Value of Derivative Liabilities Issued |  |  |  |  |  | 360,000 | 265,000
Fair value of conversion feature bifurcated from convertible promissory note |  |  |  |  | 360,000 |  |
Change in Fair value of Derivative Liabilities |  |  |  |  |  | 185,000 | 0
Fair value adjustment of conversion feature |  |  |  |  | 185,000 |  |
Reclassification of Derivatives to Equity |  |  |  |  | (810,000) | (810,000) | 0
Fair Value of Derivative Liabilities |  |  |  |  | 0 | 0 | 265,000
Emerald Financing - Warrant Liability |  |  |  |  |  |  |
Fair Value Of Derivative Liabilities [Roll Forward] |  |  |  |  |  |  |
Fair Value of Derivative Liabilities |  |  | 0 | 15,251,413 | 0 | 0 |
Fair Value of Derivative Liabilities Issued |  | $ 5,707,423 | $ 4,717,211 | 0 | 10,424,634 | 10,424,634 |
Change in Fair value of Derivative Liabilities |  |  |  | 12,239,322 | (2,318,600) | 4,826,779 |
Reclassification of Derivatives to Equity |  |  |  | 0 | 0 | 0 |
Fair Value of Derivative Liabilities |  |  |  | $ 27,490,735 | $ 8,106,034 | $ 15,251,413 | $ 0

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