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Stock-Based Compensation (Tables) | 9 Months Ended
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Dec. 31, 2012
Stock-Based Compensation [Abstract] |
Summary Of Stock-Based Compensation Expense |
|  | Three months ended |  |  | Nine months ended
|  | December 31, |  |  | December 31,
|  | 2012 |  | 2011 |  |  | 2012 |  | 2011
Cost of revenues | $ | 135 | $ | 138 |  | $ | 518 | $ | 908
Research and development |  | 627 |  | 623 |  |  | 1,781 |  | 1,948
Selling, general and administrative |  | 1,167 |  | 1,357 |  |  | 3,669 |  | 4,841
Total | $ | 1,929 | $ | 2,118 |  | $ | 5,968 | $ | 7,697
Schedule Of Weighted Average Assumptions Used In The Black-Scholes Valuation Model For Stock Options Granted |
| Three months ended |  |  | Nine months ended |
| December 31, |  |  | December 31, |
| 2012 |  | 2011 |  |  | 2012 |  | 2011 |
Expected volatility | 72.4 | % | 79.7 | % |  | 72.0 | % | 69.7 | %
Risk-free interest rate | 1.0 | % | 1.1 | % |  | 0.9 | % | 1.8 | %
Expected life (years) | 5.9 |  | 5.9 |  |  | 5.9 |  | 5.9 |
Dividend yield | None |  | None |  |  | None |  | None |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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