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Computation of Net Income (Loss) per Common Share (Tables)
 6 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Reconciliation of Numerators and Denominators of EPS Calculation
The following table reconciles the numerators and denominators of the earnings per share calculation for the three and six months ended September 30, 2018 and 2017 (in thousands, except per share data):
 
Three months ended September 30,
 
Six months ended September 30,
 
2018
 
2017
 
2018
 
2017
Numerator:
 
 
 
 
 
 
 
     Net income (loss)
$
22,558

 
$
(7,281
)
 
$
17,821

 
$
(22,533
)
Denominator:
 
 
 
 
 
 
 
Weighted-average shares of common stock outstanding
21,252

 
19,531

 
21,126

 
18,316

Weighted-average shares subject to repurchase
(939
)
 
(471
)
 
(886
)
 
(391
)
Shares used in per-share calculation ― basic
20,313

 
19,060

 
20,240

 
17,925

Shares used in per-share calculation ― diluted
20,581

 
19,060

 
20,560

 
17,925

Net income (loss) per share ― basic
$
1.11

 
$
(0.38
)
 
$
0.88

 
$
(1.26
)
Net income (loss) per share ― diluted
$
1.10

 
$
(0.38
)
 
$
0.87

 
$
(1.26
)