Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Summary of Restricted Stock Award and Unit Activity (Details)

v3.19.3.a.u2
Stock-Based Compensation - Summary of Restricted Stock Award and Unit Activity (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restricted stock      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Number of unvested restricted shares, beginning of period (in shares) 1,535,811 976,027 613,056
Granted, number of unvested restricted shares (in shares) 4,011,073 1,579,911 876,846
Vested, number of unvested restricted shares (in shares) (676,108) (626,671) (423,977)
Forfeited, number of unvested restricted shares (in shares) (772,458) (393,456) (89,898)
Number of unvested restricted shares, end of period (in shares) 4,098,318 1,535,811 976,027
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Unvested restricted shares, weighted average grant date fair value, beginning of period (in dollars per share) $ 11.57 $ 18.71 $ 32.90
Granted, weighted average grant date fair value (in dollars per share) 3.74 9.90 15.14
Vested, weighted average grant date fair value (in dollars per share) 12.89 18.05 29.90
Forfeited, weighted average grant date fair value (in dollars per share) 6.05 12.23 27.91
Unvested restricted shares, weighted average grant date fair value,, end of period (in dollars per share) $ 4.73 $ 11.57 $ 18.71
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Number of unvested restricted shares, beginning of period (in shares) 0 0 0
Granted, number of unvested restricted shares (in shares) 2,009,144 0 0
Vested, number of unvested restricted shares (in shares) 0 0 0
Forfeited, number of unvested restricted shares (in shares) (225,484) 0 0
Number of unvested restricted shares, end of period (in shares) 1,783,660 0 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Unvested restricted shares, weighted average grant date fair value, beginning of period (in dollars per share) $ 0 $ 0 $ 0
Granted, weighted average grant date fair value (in dollars per share) 2.85 0 0
Vested, weighted average grant date fair value (in dollars per share) 0 0 0
Forfeited, weighted average grant date fair value (in dollars per share) 1.98 0 0
Unvested restricted shares, weighted average grant date fair value,, end of period (in dollars per share) $ 2.96 $ 0 $ 0