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Stockholders' Equity and Stock-Based Compensation (Details 4) - $ / shares
 12 Months Ended
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