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Consolidated Statements of Shareholders' Equity - USD ($)
Common Stock [Member]
Additional Paid-in Capital Common Stock [Member]
Retained Earnings [Member]
Other Comprehensive (Loss) Income [Member]
Total
Beginning balance at Mar. 31, 2017 $ 186,000 $ 205,646,000 $ 59,246,000 $ (7,441,000) $ 257,637,000
Beginning balance (in shares) at Mar. 31, 2017 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 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        
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 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
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative-effect adjustment | ASU 2016-01 [Member]       0  
Adjusted beginning balance at Mar. 31, 2019       (6,887,000)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Compensation recognized under employee stock plans $ 0 4,141,000 0 0 $ 4,141,000
Exercise of stock options $ 1,000 456,000 0 0 457,000
Exercise of stock options (in shares) 59,600        
Issuance of common stock upon vesting of RSUs, net of shares withheld for employee taxes $ 1,000 (1,063,000) 0 0 (1,062,000)
Issuance of common stock upon vesting of RSUs, net of shares withheld for employee taxes (in shares) 92,380        
Unrealized gain on investments, net of tax         0
Foreign currency translation $ 0 0 0 (481,000) (481,000)
Net (loss) income 0 0 (7,290,000) 0 (7,290,000)
Ending balance at Mar. 31, 2020 $ 190,000 $ 218,581,000 $ 64,117,000 $ (7,368,000) $ 275,520,000
Ending balance (in shares) at Mar. 31, 2020 18,969,380       18,969,380