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Computation of Net Income (Loss) per Common Share (Tables)
 9 Months Ended
Dec. 31, 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 nine months ended December 31, 2018 and 2017 (in thousands, except per share data):
 
Three months ended December 31,
 
Nine months ended December 31,
 
2018
 
2017
 
2018
 
2017
Numerator:
 
 
 
 
 
 
 
     Net income (loss)
$
17,293

 
$
(4,248
)
 
$
35,114

 
$
(26,782
)
Denominator:
 
 
 
 
 
 
 
Weighted-average shares of common stock outstanding
21,396

 
20,889

 
21,216

 
19,189

Weighted-average shares subject to repurchase
(977
)
 
(940
)
 
(916
)
 
(575
)
Shares used in per-share calculation ― basic
20,419

 
19,949

 
20,300

 
18,614

Shares used in per-share calculation ― diluted
20,864

 
19,949

 
20,538

 
18,614

Net income (loss) per share ― basic
$
0.85

 
$
(0.21
)
 
$
1.73

 
$
(1.44
)
Net income (loss) per share ― diluted
$
0.83

 
$
(0.21
)
 
$
1.71

 
$
(1.44
)