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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
Balance at Mar. 31, 2013 $ 145,000 $ 114,737,000 $ (117,550,000) $ (846,000) $ (3,514,000)
Balance (in shares) at Mar. 31, 2013 14,460,979        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Compensation recognized under employee stock plans $ 0 969,000 0 0 969,000
Common stock issued under stock plans, net of shares withheld for employee taxes (in shares) 606,666        
Common stock issued under stock plans, net of shares withheld for employee taxes $ 6,000 5,760,000     5,766,000
Repurchase of options granted   (627,000)     (627,000)
Tax benefit from employee stock options exercised 0 (286,000) 0 0 (286,000)
Unrealized gain (loss) on investments, net of tax 0 0 0 34,000 34,000
Foreign currency translation 0 0 0 (65,000) (65,000)
Net income 0 0 107,359,000 0 107,359,000
Balance at Mar. 31, 2014 $ 151,000 120,553,000 (10,191,000) (877,000) 109,636,000
Balance (in shares) at Mar. 31, 2014 15,067,645        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Compensation recognized under employee stock plans $ 0 2,210,000 0 0 2,210,000
Common stock issued under stock plans, net of shares withheld for employee taxes (in shares) 123,734        
Common stock issued under stock plans, net of shares withheld for employee taxes $ 1,000 1,246,000     1,247,000
Issuance of common stock upon vesting of RSU's, net of shares withheld for employee taxes (in shares) 23,219        
Issuance of common stock upon vesting of RSU's, net of shares withheld for employee taxes $ 0 (806,000)     (806,000)
Tax benefit from employee stock options exercised $ 0 1,131,000 0 0 1,131,000
Common stock issued in connection with public offering (in shares) 2,760,000        
Common stock issued in connection with public offering $ 28,000 71,732,000 0 0 71,760,000
Stock issuance costs 0 (4,787,000)     (4,787,000)
Unrealized gain (loss) on investments, net of tax 0 0 0 24,000 24,000
Foreign currency translation 0 0 0 (1,665,000) (1,665,000)
Net income 0 0 11,453,000 0 11,453,000
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
Common stock issued under stock plans, net of shares withheld for employee taxes (in shares) 510,637        
Common stock issued under stock plans, net of shares withheld for employee taxes $ 5,000 5,387,000 0 0 5,392,000
Issuance of common stock upon vesting of RSU's, net of shares withheld for employee taxes (in shares) 46,516        
Issuance of common stock upon vesting of RSU's, net of shares withheld for employee taxes $ 0 (913,000) 0 0 (913,000)
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
Balance at Mar. 31, 2016 $ 185,000 $ 203,650,000 $ 11,825,000 $ (4,852,000) $ 210,808,000
Balance (in shares) at Mar. 31, 2016 18,531,751