Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Restricted stock activities (Details)

v3.19.2
Stockholders' Equity - Restricted stock activities (Details)
 6 Months Ended
Jun. 30, 2019
$ / shares
shares
Restricted Stock Units (RSUs)  
Number of Nonvested Beginning | shares 1,032,084
Number of Granted | shares 309,000
Number of Forfeited | shares (296,750)
Number of Vested | shares (76,000)
Number of Nonvested Ending | shares 968,334
Weighted Average Grant Date Fair Value Nonvested at December 31, 2018 | $ / shares $ 7.77
Weighted Average Grant Date Fair Value Granted | $ / shares 2.99
Weighted Average Grant Date Fair Value Forfeited | $ / shares 7.98
Weighted Average Grant Date Fair Value Vested | $ / shares 10.81
Weighted Average Grant Date Fair Value Nonvested at March 31, 2019 | $ / shares $ 5.94
Restricted Stock [Member]  
Number of Nonvested Beginning | shares 502,636
Number of Granted | shares 50,000
Number of Nonvested Ending | shares 552,636
Weighted Average Grant Date Fair Value Nonvested at December 31, 2018 | $ / shares $ 5.76
Weighted Average Grant Date Fair Value Granted | $ / shares 3.80
Weighted Average Grant Date Fair Value Nonvested at March 31, 2019 | $ / shares $ 5.58