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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
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative-effect adjustment | ASU 2016-09 [Member] $ 0 $ 0 $ 892,000 $ 0 $ 892,000
Cumulative-effect adjustment | ASC 606 [Member] 0 0 345,000 0 345,000
Cumulative-effect adjustment for the revision of prior financial statements 0 0 7,449,000 0 7,449,000
Beginning balance at Mar. 31, 2016 $ 185,000 203,650,000 11,825,000 (4,852,000) 210,808,000
Beginning balance (in shares) at Mar. 31, 2016 18,531,751        
Adjusted beginning balance at Mar. 31, 2016 $ 185,000 203,650,000 20,511,000 (4,852,000) 219,494,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
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 (loss) income 0 0 38,735,000 0 38,735,000
Ending balance at Mar. 31, 2017 $ 186,000 205,646,000 59,246,000 (7,441,000) 257,637,000
Ending balance (in shares) at Mar. 31, 2017 18,648,854        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative-effect adjustment | ASU 2016-01 [Member]       0  
Adjusted beginning balance at Mar. 31, 2017       (7,441,000)  
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 (loss) income 0 0 19,264,000 0 19,264,000
Ending balance at Mar. 31, 2018 $ 189,000 213,609,000 78,510,000 (5,428,000) $ 286,880,000
Ending balance (in shares) at Mar. 31, 2018 18,893,102       18,893,102
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative-effect adjustment | ASU 2016-01 [Member] $ 0 0 746,000 (746,000) $ 0
Adjusted beginning balance at Mar. 31, 2018 189,000 213,609,000 79,256,000 (6,174,000) 286,880,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Compensation recognized under employee stock plans 0 5,564,000 0 0 5,564,000
Exercise of stock options $ 1,000 256,000 0 0 257,000
Exercise of stock options (in shares) 42,032        
Issuance of common stock upon vesting of RSUs, net of shares withheld for employee taxes $ 0 (322,000) 0 0 (322,000)
Issuance of common stock upon vesting of RSUs, net of shares withheld for employee taxes (in shares) 46,081        
Repurchase and cancellation of treasury stock, including fees $ (2,000) (4,060,000) 0 0 (4,062,000)
Repurchase and cancellation of treasury stock, including fees (in shares) (163,815)        
Unrealized gain (loss) on investments, net of tax         0
Foreign currency translation $ 0 0 0 (713,000) (713,000)
Net (loss) income 0 0 (7,849,000) 0 (7,849,000)
Ending balance at Mar. 31, 2019 $ 188,000 $ 215,047,000 $ 71,407,000 $ (6,887,000) $ 279,755,000
Ending balance (in shares) at Mar. 31, 2019 18,817,400       18,817,400