Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity and Stock-Based Compensation (Details 4)

v3.19.1
Stockholders' Equity and Stock-Based Compensation (Details 4) - $ / shares
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Stockholders Equity And Stockbased Compensation Details 4Abstract    
Non-vested at beginning of period 1,669,016 1,542,736
Granted 1,784,455
Vested (1,514,195)
Forfeited (143,980)
Non-vested at end of period 1,669,016 1,669,016
Weighted average fair value grant date, beginning of period $ 0.54 $ 1.10
Weighted average fair value grant date, granted 0.70
Weighted average fair value grant date, vested 1.27
Weighted average fair value grant date, forfeited 0.83
Weighted average fair value grant date, end of period 0.54 0.54
Weighted average exercise price, beginning of period 0.91 1.58
Weighted average exercise price, granted 0.90
Weighted average exercise price, vested 1.58
Weighted average exercise price, forfeited 1.10
Weighted average exercise price, end of period $ 0.91 $ 0.91