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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 |  |  |  |

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