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Stock-Based Compensation (Tables) | 3 Months Ended
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Jun. 30, 2014
Summary of Stock-Based Compensation Expense | The Company accounts for its stock-based compensation at fair value. The following table summarizes stock-based compensation expense by financial statement line item for the three months ended June 30, 2014 and 2013 (in thousands):
| Three months ended June 30, |
| 2014 |  |  | 2013 |
Cost of revenues | $ | 153 |  |  | $ | 205 |
Research and development |  | 479 |  |  |  | 575 |
Selling, general and administrative |  | 949 |  |  |  | 1,355 |
Total | $ | 1,581 |  |  | $ | 2,135 |
Schedule of Weighted Average Assumptions used in Black-Scholes Valuation Model for Stock Options Granted | The weighted-average assumptions used in the Black-Scholes valuation model for stock options granted during the three months ended June 30, 2014 and 2013 are as follows:
| Three months ended June 30, |
| 2014 |  |  | 2013 |
Expected volatility |  | 85.5 | % |  |  | 74.6 | %
Risk-free interest rate |  | 1.9 | % |  |  | 1.7 | %
Expected life (years) |  | 5.8 |  |  |  | 5.9 |
Dividend yield |  | 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 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 2: 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=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F 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 + 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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