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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Stock-Based Compensation Expense | The following table summarizes stock-based compensation expense (in thousands):
| Year ended December 31,
| 2013 |  | 2012 |  | 2011
Employee stock-based compensation in: |  |  |  |  |
Cost of revenue | $ | 2,411 |  |  | $ | 2,828 |  |  | $ | 2,912 |
Research and development expense | 4,431 |  |  | 6,151 |  |  | 6,618 |
Selling, general and administrative expense | 9,160 |  |  | 9,449 |  |  | 10,798 |
Total stock-based compensation in operating expense | 13,591 |  |  | 15,600 |  |  | 17,416 |
Total employee stock-based compensation recognized in income (loss) from continuing operations | $ | 16,002 |  |  | $ | 18,428 |  |  | $ | 20,328 |
Valuation Assumptions for Stock Options | The Company estimated the fair value of all employee stock options using a Black-Scholes valuation model with the following weighted average assumptions:
| Employee Stock Options
| 2013 |  | 2012 |  | 2011
Expected term (in years) | 4.70 |  |  | 4.70 |  |  | 4.75 |
Volatility | 50 | % |  | 56 | % |  | 55 | %
Risk-free interest rate | 0.9 | % |  | 0.9 | % |  | 1.8 | %
Dividend yield | 0.0 | % |  | 0.0 | % |  | 0.0 | %
Employee Stock Purchase Plan | The call option and put option were valued using the Black-Scholes option pricing model with the following assumptions:
| Employee Stock Purchase Plan
| 2013 |  | 2012 |  | 2011
Expected term (in years) | 0.50 |  |  | 0.50 |  |  | 0.50 |
Volatility | 31 | % |  | 49 | % |  | 45 | %
Risk-free interest rate | 0.2 | % |  | 0.2 | % |  | 0.2 | %
Dividend yield | 0.0 | % |  | 0.0 | % |  | 0.0 | %

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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 employee stock purchase plans, including, but not limited to: (a) expected term, (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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- 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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