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STOCK-BASED COMPENSATION (Tables)
 9 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock Option Expense and Activity
The following tables summarize information pertaining to the stock-based compensation expense from stock options and stock awards (in thousands, except weighted-average grant-date fair value and recognition period):
 
 
Three Months Ended December 31,
 
Nine Months Ended December 31,
 
 
2018
 
2017
 
2018
 
2017
Cost of service revenue
 
$
680

 
$
455

 
$
1,775

 
$
1,319

Research and development
 
3,570

 
1,794

 
8,587

 
4,445

Sales and marketing
 
5,590

 
3,362

 
13,262

 
8,577

General and administrative
 
2,695

 
2,519

 
7,950

 
6,797

Total
 
$
12,535

 
$
8,130

 
$
31,574

 
$
21,138

 
 
 
Nine Months Ended December 31,
 
 
2018
 
2017
Stock options outstanding at the beginning of the period:
 
3,998

 
4,462

Options granted
 
222

 
427

Options exercised 
 
(641
)
 
(421
)
Options canceled and forfeited
 
(192
)
 
(176
)
Options outstanding at the end of the period:
 
3,387

 
4,292

Weighted-average fair value of grants during the period
 
$
8.27

 
$
5.30

Total intrinsic value of options exercised during the period
 
$
9,148

 
$
4,312

Weighted-average remaining recognition period at period-end (in years) 
 
2.53

 
2.14

 
 
 
 
 
Stock awards outstanding at the beginning of the period:
 
5,939

 
4,950

Stock awards granted
 
4,993

 
2,884

Stock awards vested 
 
(2,123
)
 
(1,615
)
Stock awards canceled and forfeited
 
(700
)
 
(447
)
Stock awards outstanding at the end of the period: 
 
8,109

 
5,772

Weighted-average fair value of grants during the period
 
$
20.05

 
$
13.89

Weighted-average remaining recognition period at period-end (in years) 
 
2.4

 
2.67

Total unrecognized compensation expense at period-end
 
$
112,970

 
$
64,625