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v3.19.1

Stockholders' Equity and Stock-Based Compensation (Details 7) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Expected volatility | 90.00% |
Risk free interest rate | 2.84% |
Dividend yield rate | 0.00% | 0.00%
Weighted average remaining expected life | 9 years 9 months 18 days |
Closing price per share - common stock | $ 0.88 |
Option Grants Awards Issued In 2017 [Member] |  |
Dividend yield rate | 0.00% |
Weighted average remaining expected life | 4 years 2 months 12 days |
Closing price per share - common stock | $ 1.05 |
Minimum [Member] |  |
Expected volatility | 87.50% |
Risk free interest rate | 2.24% |
Maximum [Member] |  |
Expected volatility | 91.00% |
Risk free interest rate | 2.42% |

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- Definition Weighted average expected volatility rate of share-based compensation awards. + 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)(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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