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Consolidated Statements of Shareholders' Equity - USD ($)
Common Stock [Member]
Additional Paid-in Capital Common Stock [Member]
Retained Earnings (Accumulated Deficit) [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Total
Beginning balance at Mar. 31, 2015 $ 180,000 $ 191,279,000 $ 1,262,000 $ (2,518,000) $ 190,203,000
Balance (in shares) at Mar. 31, 2015 17,974,598        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Compensation recognized under employee stock plans $ 0 2,584,000 0 0 2,584,000
Exercise of stock options $ 5,000 5,387,000 0 0 5,392,000
Exercise of stock options (in shares) 510,637        
Issuance of common stock upon vesting of RSUs, net of shares withheld for employee taxes $ 0 (913,000) 0 0 (913,000)
Issuance of common stock upon vesting of RSUs, net of shares withheld for employee taxes (in shares) 46,516        
Tax benefit from employee stock options exercised $ 0 5,313,000 0 0 5,313,000
Unrealized gain (loss) on investments, net of tax 0 0 0 (13,000) (13,000)
Foreign currency translation 0 0 0 (2,321,000) (2,321,000)
Net income 0 0 10,563,000 0 10,563,000
Ending balance (As Previously Reported [Member]) at Mar. 31, 2016 $ 185,000 203,650,000 11,825,000 (4,852,000) 210,808,000
Ending balance at Mar. 31, 2016       (4,852,000)  
Balance (in shares) (As Previously Reported [Member]) at Mar. 31, 2016 18,531,751        
Balance (in shares) at Mar. 31, 2016 18,531,751        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative-effect adjustment | Adjustment [Member] | ASU 2016-09 [Member] $ 0 0 892,000 0 892,000
Balance April 1, 2016 | ASU 2016-09 [Member] 185,000 203,650,000 12,717,000 (4,852,000) 211,700,000
Compensation recognized under employee stock plans 0 3,383,000 0 0 3,383,000
Exercise of stock options $ 1,000 1,661,000 0 0 1,662,000
Exercise of stock options (in shares) 133,731        
Issuance of common stock upon vesting of RSUs, net of shares withheld for employee taxes $ 1,000 (1,059,000) 0 0 (1,058,000)
Issuance of common stock upon vesting of RSUs, net of shares withheld for employee taxes (in shares) 53,031        
Repurchase and cancellation of treasury stock, including fees $ (1,000) (1,989,000) 0 0 (1,990,000)
Repurchase and cancellation of treasury stock, including fees (in shares) (69,659)        
Unrealized gain (loss) on investments, net of tax $ 0 0 0 196,000 196,000
Foreign currency translation 0 0 0 (2,785,000) (2,785,000)
Net income 0 0 37,573,000 0 37,573,000
Ending balance at Mar. 31, 2017 $ 186,000 205,646,000 50,290,000 (7,441,000) $ 248,681,000
Balance (in shares) at Mar. 31, 2017 18,648,854       18,648,854
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Compensation recognized under employee stock plans $ 0 3,766,000 0 0 $ 3,766,000
Exercise of stock options $ 1,000 480,000 0 0 481,000
Exercise of stock options (in shares) 55,351        
Issuance of common stock upon vesting of RSUs, net of shares withheld for employee taxes $ 1,000 (597,000) 0 0 (596,000)
Issuance of common stock upon vesting of RSUs, net of shares withheld for employee taxes (in shares) 47,508        
Repurchase and cancellation of treasury stock, including fees $ (4,000) (9,247,000) 0 0 (9,251,000)
Repurchase and cancellation of treasury stock, including fees (in shares) (374,740)        
Exercise of warrant for shares of common stock $ 5,000 13,561,000 0 0 13,566,000
Exercise of warrant for shares of common stock (in shares) 516,129        
Unrealized gain (loss) on investments, net of tax $ 0 0 0 218,000 218,000
Foreign currency translation 0 0 0 1,795,000 1,795,000
Net income 0 0 16,316,000 0 16,316,000
Ending balance at Mar. 31, 2018 $ 189,000 $ 213,609,000 $ 66,606,000 $ (5,428,000) $ 274,976,000
Balance (in shares) at Mar. 31, 2018 18,893,102       18,893,102