Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Restricted Stock Units and Restricted Stock Awards - Activity (Details)

v3.19.2
Stockholders' Equity - Restricted Stock Units and Restricted Stock Awards - Activity (Details) - Restricted stock units/awards
6 Months Ended
Jun. 30, 2019
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Number of Units, Unvested Beginning Balance | shares 1,104,643
Number of Units, Granted | shares 241,173
Number of Units, Vested | shares (195,654)
Number of Units, Unvested Ending Balance | shares 1,150,162
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted Average Grant Date Fair Value, Unvested Beginning Balance | $ / shares $ 4.45
Weighted Average Grant Date Fair Value, Granted | $ / shares 5.93
Weighted Average Grant Date Fair Value, Vested | $ / shares 4.32
Weighted Average Grant Date Fair Value, Unvested Ending Balance | $ / shares $ 4.74