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Stock-based compensation (Tables)
12 Months Ended
Mar. 31, 2020
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 price
 
Weighted-average remaining
contractual life
(in years)
 
Aggregate intrinsic
values
(in thousands) (1)
Balance as of December 31, 2018
2,746,670

 
$
12.91

 
 
 
 
Granted
115,100

 
7.95

 
 
 
 
Canceled or forfeited
(286,191
)
 
16.98

 
 
 
 
Balance as of March 31, 2019
2,575,579

 
12.24

 
6.9
 
$
6,958

Granted
202,560

 
14.18

 
 
 
 

Exercised
(334,572
)
 
4.08

 
 
 
 

Canceled or forfeited
(444,014
)
 
15.07

 
 
 
 

Balance as of March 31, 2020
1,999,553

 
$
13.17

 
6.8
 
$
3,773

 
 
 
 
 
 
 
 
Exercisable, March 31, 2020
1,291,647

 
$
12.06

 
6.1
 
$
3,469

(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 $9.84, as reported on the New York Stock Exchange on March 31, 2020.
 
Options
outstanding
 
Weighted-average exercise price 
 
Weighted-average remaining
contractual life
(in years)
 
Aggregate intrinsic
values
(in thousands) (1)
Balance as of December 31, 2018
1,482,782

 
$
8.94

 
 
 
 
Exercised
(62,450
)
 
1.84

 
 
 
 
Canceled or forfeited
(96,900
)
 
26.84

 
 
 
 
Balance as of March 31, 2019
1,323,432

 
7.96

 
6.0
 
$
8,646

Exercised
(53,100
)
 
2.40

 
 
 
 
Canceled or forfeited
(17,400
)
 
26.84

 
 
 
 
Balance as of March 31, 2020
1,252,932

 
$
7.97

 
5.0
 
$
7,487

 
 
 
 
 
 
 
 
Exercisable, March 31, 2020
952,932

 
$
1.98

 
4.4
 
$
7,487

(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 $9.84, as reported on the New York Stock Exchange on March 31, 2020.

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,
 
2020
 
2019
 
2018
 
2017
Stock-based compensation expense
$
2,308

 
$
590

 
$
3,219

 
$
2,435

Intrinsic value of options exercised
3,580

 

 
2,890

 
12,841

Weighted-average grant date fair value
   of options granted (per share)
$
5.55

 
$
3.12

 
$
6.81

 
$
9.51

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,
 
2020
 
2019
 
2018
 
2017
Stock-based compensation expense
$

 
$

 
$
1,168

 
$
3,489

Intrinsic value of options exercised
609

 
419

 
8,669

 
42,874

Weighted-average grant date fair value
   of options granted (per share)
$

 
$

 
$

 
$
10.65

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,
 
2020
 
2019
 
2018
 
2017
Expected term (in years)
6.5

 
6.3

 
6.3

 
6.2

Expected volatility
35.57
%
 
35.13
%
 
32.02
%
 
32.42
%
Risk-free interest rate
2.07
%
 
2.55
%
 
2.68
%
 
2.14
%
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 outstanding
 
Weighted-average grant date fair value
Balance as of December 31, 2018
2,036,124

 
$
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, 2019
2,786,398

 
13.26

Granted
673,461

 
14.26

Vested
(762,818
)
 
15.97

Canceled or forfeited
(385,273
)
 
12.66

Balance as of March 31, 2020
2,311,768

 
$
12.86


(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,
 
2020
 
2019
 
2018
 
2017
Stock-based compensation expense
$
13,181

 
$
3,093

 
$
12,434

 
$
7,550

Intrinsic value of RSUs released
$
12,448

 
$
3,387

 
$
6,280

 
$
3,398