XML 58 R38.htm IDEA: XBRL DOCUMENT v3.21.1
Stock-based compensation (Tables)
 12 Months Ended
Mar. 31, 2021
Share-based Payment Arrangement [Abstract]  
Summary of Stock Option Activity and Related Information
The following table summarizes the activity for options that vest solely based upon the satisfaction of a service condition as follows:
 Options
outstanding		Weighted-average exercise priceWeighted-average remaining
contractual life
(in years)
Aggregate intrinsic
values
(in thousands) (1)
Balance as of December 31, 20182,746,670 $12.91 
Granted115,100 7.95 
Canceled or forfeited(286,191)16.98 
Balance as of March 31, 20192,575,579 12.24 6.9$6,958 
Granted202,560 14.18 
Exercised(334,572)4.08 
Canceled or forfeited(444,014)15.07 
Balance as of March 31, 20201,999,553 13.17 6.8$3,773 
Exercised(337,376)4.36   
Canceled or forfeited(21,196)23.24   
Balance as of March 31, 20211,640,981 $14.86 6.1$19,650 
Exercisable, March 31, 20211,312,728 $14.99 5.6$15,549 
(1)The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the Company's closing stock price of $26.83, as reported on the New York Stock Exchange on March 31, 2021.
Options
outstanding		Weighted-average exercise price Weighted-average remaining
contractual life
(in years)
Aggregate intrinsic
values
(in thousands) (1)
Balance as of December 31, 20181,482,782 $8.94 
Exercised(62,450)1.84 
Canceled or forfeited(96,900)26.84 
Balance as of March 31, 20191,323,432 7.96 6.0$8,646 
Exercised(53,100)2.40 
Canceled or forfeited(17,400)26.84 
Balance as of March 31, 20201,252,932 7.97 5.0$7,487 
Exercised(144,340)1.89   
Balance as of March 31, 20211,108,592 $8.72 4.0$20,077 
Exercisable, March 31, 2021808,592 $2.00 3.3$20,077 
(1)The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the Company's closing stock price of $26.83, as reported on the New York Stock Exchange on March 31, 2021.
Summary of Additional Information Relating to Stock Options Activity
Additional information relating to service-based options is as follows (in thousands, except per share data):
Year ended
March 31,		Three months ended March 31,
(transition period)		Year ended
December 31,
 2021202020192018
Stock-based compensation expense$1,671 $2,308 $590 $3,219 
Intrinsic value of options exercised 5,620 3,580 — 2,890 
Weighted-average grant date fair value
   of options granted (per share) 		$— $5.55 $3.12 $6.81 
Additional information relating to options that vest based upon the satisfaction of performance or market conditions is as follows (in thousands, except per share data):
Year ended
March 31,		Three months ended March 31,
(transition period)		Year ended
December 31,
2021202020192018
Stock-based compensation expense$— $— $— $1,168 
Intrinsic value of options exercised3,117 609 419 8,669 
Weighted-average grant date fair value
   of options granted (per share) 		$— $— $— $— 
Summary of Weighted-Average Assumptions
The fair value of service-based stock options granted were calculated using the following weighted-average assumptions:
Year ended
March 31,		Three months ended March 31,
(transition period)		Year ended
December 31,
202020192018
Expected term (in years)6.56.36.3
Expected volatility35.57 %35.13 %32.02 %
Risk-free interest rate2.07 %2.55 %2.68 %
Expected dividend yield— %— %— %
Summary of Restricted Stock Unit Activity and Related Information
The following table summarizes the activities for restricted stock awards (“RSAs”) and restricted stock units (“RSUs”) as follows:
 Shares of restricted stock outstandingWeighted-average grant date fair value
Balance as of December 31, 20182,036,124 $20.01 
Granted (1)
1,464,710 7.64 
Vested(396,514)21.79 
Canceled or forfeited(317,922)20.06 
Balance as of March 31, 20192,786,398 13.26 
Granted 673,461 14.26 
Vested(762,818)15.97 
Canceled or forfeited(385,273)12.66 
Balance as of March 31, 20202,311,768 12.86 
Granted1,206,870 17.45 
Vested(1,044,052)13.97 
Canceled or forfeited(184,971)14.19 
Balance as of March 31, 20212,289,615 $14.67 
(1)
Includes restricted stock awards granted in the period ending March 31, 2019 that vest based upon the achievement of a
specified stock price and satisfaction of a service condition. The fair values and derived service periods were determined using a Monte Carlo simulation model.
Disclosure of Additional Information Additional information relating to RSAs and RSUs is as follows (in thousands):
Year ended
March 31,		Three months ended March 31,
(transition period)		Year ended
December 31,
 2021202020192018
Stock-based compensation expense$18,012 $13,181 $3,093 $12,434 
Intrinsic value of restricted stock released$24,328 $12,448 $3,387 $6,280