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Stockholders' Equity and Stock-Based Compensation (Details 4) - $ / shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Stockholders Equity And Stockbased Compensation Details 4Abstract |  |
Non-vested at beginning of period | 1,542,736 | 450,476
Granted | 1,784,455 | 1,854,277
Vested | (1,514,195) | (762,017)
Forfeited | (143,980) |
Non-vested at end of period | 1,669,016 | 1,542,736
Weighted average fair value grant date, beginning of period | $ 1.10 | $ 3.60
Weighted average fair value grant date, granted | 0.70 | 0.77
Weighted average fair value grant date, vested | 1.27 | 1.67
Weighted average fair value grant date, forfeited | 0.83 |
Weighted average fair value grant date, end of period | 0.54 | 1.10
Weighted average exercise price, beginning of period | 1.58 | 5.40
Weighted average exercise price, granted | 0.90 | 1.05
Weighted average exercise price, vested | 1.58 | 2.54
Weighted average exercise price, forfeited | 1.10 |
Weighted average exercise price, end of period | $ 0.91 | $ 1.58

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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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