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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

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