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Stock-Based Compensation (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Schedule of RSA activity |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Unvested, December 31, 2018 |  |  | 900,000 |  |  | $ | 0.19 |
Granted |  |  | - |  |  |  | - |
Released |  |  | (450,000 | ) |  |  | 0.19 |
Unvested, March 31, 2019 |  |  | 450,000 |  |  | $ | 0.19 |
Stock options | Omnibus Incentive Plan 2014 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Schedule of shares available for future grant |  |
|  | Shares Available for Grant |
Available as of December 31, 2017 |  |  | 870,000 |
Share pool increase |  |  | 10,190,774 |
Forfeited |  |  | 427,000 |
Expired |  |  | 48,000 |
Granted |  |  | (2,393,501 | )
Available as of December 31, 2018 |  |  | 9,142,273 |
Schedule of summary of stock option activity |  |
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value* |
Outstanding, December 31, 2017 |  |  | 1,130,000 |  |  | $ | 0.60 |  |  |  | 6.89 |  |  |  |
Granted |  |  | 1,750,000 |  |  |  | 0.30 |  |  |  |  |  |  |  |
Expired |  |  | (48,000 | ) |  |  | 2.57 |  |  |  |  |  |  |  |
Forfeited |  |  | (427,000 | ) |  |  | 0.66 |  |  |  |  |  |  |  |
Outstanding, December 31, 2018 |  |  | 2,405,000 |  |  | $ | 0.33 |  |  |  | 8.71 |  |  | $ | 182,000 |
Exercisable, December 31, 2018 |  |  | 859,417 |  |  | $ | 0.37 |  |  |  | 7.39 |  |  | $ | 36,458 |
Vested and Expected to Vest, December 31, 2018 |  |  | 2,405,000 |  |  | $ | 0.33 |  |  |  | 8.71 |  |  | $ | 182,000 |
*The aggregate intrinsic value is the sum of the amounts by which the quoted market price of the Company’s stock exceeded the exercise price of the stock options at December 31, 2018 for those stock options for which the quoted market price was in excess of the exercise price (“in-the-money options”).
Schedule of fair value assumptions of stock option granted |  |
|  | Year Ended December 31, 2018 |
Dividend Yield |  |  | – |
Risk-free interest rate |  | 3.06 – 3.1 | %
Expected term (in years) |  | 5.27-5.58 |
Volatility |  | 70-93.6 | %
Stock options | Awards Granted Outside the 2014 Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Schedule of fair value assumptions of stock option granted |  |
|  |  | At Issuance |
Dividend Yield |  |  | – |
Risk-free interest rate |  |  | 2.79 | %
Expected term (in years) |  |  | 5.54 |
Volatility |  |  | 70 | %
Restricted Stock Awards | Omnibus Incentive Plan 2014 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Schedule of RSA activity |  |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Unvested, December 31, 2017 |  |  | 1,050,000 |  |  | $ | 0.75 |
Granted |  |  | 643,501 |  |  |  | 0.26 |
Released |  |  | (1,050,000 | ) |  |  | 0.75 |
Unvested, December 31, 2018 |  |  | 643,501 |  |  | $ | 0.26 |
Restricted Stock Awards | Awards Granted Outside the 2014 Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Schedule of RSA activity |  |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Unvested, December 31, 2017 |  |  | - |  |  | $ | - |
Granted |  |  | 2,500,000 |  |  |  | 0.19 |
Released |  |  | (1,600,000 | ) |  |  | 0.19 |
Unvested, December 31, 2018 |  |  | 900,000 |  |  | $ | 0.19 |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: 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) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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