Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Tables)

v3.20.4
Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Schedule of restricted stock award and unit activity
The following table summarizes restricted stock unit and performance vesting restricted stock unit activity for the twelve months ended December 31, 2020, 2019 and 2018: 
Number of
Unvested
Restricted Stock Units
Weighted
Average
Grant Date
Fair Value
Number of
Unvested
Performance Vesting Restricted Stock Units
Weighted
Average
Grant Date
Fair Value
Unvested shares as of January 1, 2018 976,027  $ 18.71  —  $ — 
Granted 1,579,911  9.90  —  — 
Vested (626,671) 18.05  —  — 
Forfeited (393,456) 12.23  —  — 
Unvested shares as of December 31, 2018 1,535,811  $ 11.57  —  $ — 
Granted 4,011,073  $ 3.74  2,009,144  2.85
Vested (676,108) 12.89  —  — 
Forfeited (772,458) 6.05  (225,484) 1.98
Unvested shares as of December 31, 2019 4,098,318  $ 4.73  1,783,660  $ 2.96 
Granted 3,069,521  0.85  —  — 
Vested (1,294,285) 5.73  —  — 
Forfeited (4,171,041) 1.68  (943,065) 1.98 
Unvested shares as of December 31, 2020 1,702,513  $ 4.74  840,595  $ 4.07