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Stock Option Plans and Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule share-based compensation costs | The impact on our results for share-based compensation was as follows (in thousands):
| Years Ended December 31,
| 2013 |  | 2012 |  | 2011
Cost of product and service revenues | $ | 1,241 |  |  | $ | 1,011 |  |  | $ | 1,398 |
Research and development | 1,359 |  |  | 889 |  |  | 1,269 |
Selling, general and administrative | 8,551 |  |  | 7,314 |  |  | 6,832 |
Total share-based compensation expense | $ | 11,151 |  |  | $ | 9,214 |  |  | $ | 9,499 |
Schedule of valuation assumptions | The weighted average assumptions used for options granted and ESPP in 2013, 2012 and 2011 were as follows:
| Years Ended December 31,
Stock Option Plans | 2013 |  | 2012 |  | 2011
Risk-free interest rate(1) | 1.2 | % |  | 0.9 | % |  | 1.6 | %
Dividend yield | — | % |  | — | % |  | — | %
Volatility(2) | 43.1 | % |  | 45.8 | % |  | 48.5 | %
Expected life(3) | 5.3 yrs |  |  | 5.2 yrs |  |  | 5.2 yrs |
| Years Ended December 31,
Employee Stock Purchase Plan | 2013 |  | 2012 |  | 2011
Risk-free interest rate(1) | 0.2 | % |  | 0.2 | % |  | 0.5 | %
Dividend yield | — | % |  | — | % |  | — | %
Volatility(2) | 35.1 | % |  | 38.5 | % |  | 40.2 | %
Expected life(3) | 0.5 - 2 yrs |  |  | 0.5 - 2 yrs |  |  | 0.5 - 2 yrs |
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(1) | The risk-free interest rate for both stock options and the ESPP is based on the zero-coupon U.S. Treasury rate curve in effect at the time of the option grant or at the beginning of the ESPP offering period.
(2) | Expected volatility for both stock options and the ESPP reflects a combination of historical and market-based implied volatility consistent with ASC 718 and SEC Staff Accounting Bulletin 107. We determined that the combination of historical and market-based implied volatility provides a more accurate reflection of our market conditions and is more representative of future stock price trends than employing solely historical volatility.
(3) | Represents the period of time that options granted are expected to be outstanding, which is derived from historical data on employee exercise and post-vesting employment termination behavior.
Schedule of stock options activity | A summary of option activity under the 2009 Plan for the years ended December 31, 2013, 2012 and 2011 is presented below:
Options: | Number of Shares |  | Weighted Average Exercise Price
| (in thousands) |  |
Outstanding at December 31, 2010 | 4,740 |  |  | $ | 12.86 |
Granted | 494 |  |  | $ | 14.57 |
Exercised | (413 | ) |  | $ | 8.30 |
Expired | (86 | ) |  | $ | 13.59 |
Forfeited | (42 | ) |  | $ | 20.76 |
Outstanding at December 31, 2011 | 4,693 |  |  | $ | 13.36 |
Granted | 645 |  |  | $ | 14.85 |
Exercised | (669 | ) |  | $ | 8.65 |
Expired | (84 | ) |  | $ | 14.02 |
Forfeited | (115 | ) |  | $ | 21.44 |
Outstanding at December 31, 2012 | 4,470 |  |  | $ | 14.06 |
Granted | 502 |  |  | $ | 20.25 |
Exercised | (1,686 | ) |  | $ | 12.53 |
Expired | (56 | ) |  | $ | 15.66 |
Forfeited | (87 | ) |  | $ | 14.68 |
Outstanding at December 31, 2013 | 3,143 |  |  | $ | 15.82 |
Vested and expected to vest at December 31, 2013 | 3,114 |  |  | $ | 15.79 |
Exercisable at December 31, 2013 | 2,078 |  |  | $ | 15.11 |
Schedule of outstanding and exercisable options by exercise price range | The ranges of outstanding and exercisable options for equity share-based payment awards as of December 31, 2013 were as follows:
Range of Exercise Prices | Number Outstanding |  | Weighted Average Exercise Price of Outstanding Options |  | Number Exercisable |  | Weighted Average Exercise Price of Exercisable Options
| (in thousands) |  |  |  | (in thousands) |  |
$6.40 - $10.41 | 332 |  |  | $ | 8.71 |  |  | 332 |  |  | $ | 8.71 |
$10.58 - $10.75 | 384 |  |  | $ | 10.65 |  |  | 384 |  |  | $ | 10.65 |
$11.27 - $13.53 | 347 |  |  | $ | 12.84 |  |  | 291 |  |  | $ | 12.77 |
$13.67 - $14.10 | 358 |  |  | $ | 13.86 |  |  | 143 |  |  | $ | 13.94 |
$14.16 - $15.04 | 364 |  |  | $ | 14.58 |  |  | 167 |  |  | $ | 14.67 |
$15.06 - $17.29 | 382 |  |  | $ | 16.79 |  |  | 106 |  |  | $ | 16.51 |
$17.49 - $20.95 | 434 |  |  | $ | 19.84 |  |  | 369 |  |  | $ | 20.12 |
$21.07 - $23.19 | 330 |  |  | $ | 22.52 |  |  | 104 |  |  | $ | 21.50 |
$23.41 - $26.99 | 136 |  |  | $ | 24.61 |  |  | 106 |  |  | $ | 24.76 |
$29.16 - $29.16 | 76 |  |  | $ | 29.16 |  |  | 76 |  |  | $ | 29.16 |
$6.40 - $29.16 | 3,143 |  |  | $ | 15.82 |  |  | 2,078 |  |  | $ | 15.11 |
Schedule of restricted stock and restricted stock units activity | A summary of activity of restricted stock and restricted stock units ("RSUs") granted under the 2009 Plan as of December 31, 2013 is presented below:
| Shares of Restricted Stock |  | Weighted-Average Grant Date Fair Value Per Share | Restricted Stock Units |  | Weighted-Average Grant Date Fair Value
| (in thousands) |  |  | (in thousands) |  |
Nonvested at December 31, 2010 | 77 |  |  | $ | 12.91 |  | 308 |  |  | $ | 12.98 |
Granted | 68 |  |  | $ | 14.71 |  | 145 |  |  | $ | 14.39 |
Vested | (77 | ) |  | $ | 12.91 |  | (152 | ) |  | $ | 14.26 |
Forfeited | — |  |  | — |  | (14 | ) |  | $ | 12.82 |
Nonvested at December 31, 2011 | 68 |  |  | $ | 14.71 |  | 287 |  |  | $ | 13.03 |
Granted | 67 |  |  | $ | 14.19 |  | 274 |  |  | $ | 14.58 |
Vested | (78 | ) |  | $ | 14.64 |  | (153 | ) |  | $ | 12.90 |
Forfeited | — |  |  | — |  | (19 | ) |  | $ | 14.55 |
Nonvested at December 31, 2012 | 58 |  |  | $ | 14.19 |  | 389 |  |  | $ | 14.09 |
Granted | $ | 55 |  |  | $ | 18.20 |  | 190 |  |  | 19.87 |
Vested | $ | (61 | ) |  | $ | 14.23 |  | (195 | ) |  | 14.31 |
Forfeited | — |  |  | — |  | (22 | ) |  | 14.08
Nonvested at December 31, 2013 | $ | 52 |  |  | $ | 18.43 |  | 362 |  |  | 17.15 |
PSU 2011 percentile placement | The following table shows the percent of PSUs granted in 2011 and eligible for further time-based vesting based on our percentile placement:
Percentile Placement of Our Total Shareholder Return |  | % of PSUs Eligible for Time- Based Vesting
Below the 35th percentile |  | —%
At least the 35th percentile, but below the 50th percentile |  | 50%
At least the 50th percentile, but below the 65th percentile |  | 100%
At least the 65th percentile, but below the 75th percentile (1) |  | 110% to 119%
At or above the 75th percentile |  | 120%
PSU 2012 percentile placement | The following table shows the percent of PSUs granted in 2012 eligible for further time-based vesting based on our percentile placement:
Percentile Placement of Our Total Shareholder Return | % of PSUs Eligible for Time- Based Vesting
Below the 35th percentile | —%
At least the 35th percentile, but below the 50th percentile | 50%
At least the 50th percentile | 100%
Schedule of performance-based units activity | A summary of activity of the PSUs for the years ended December 31, 2013 and 2012 is presented below:
Performance-based Stock Units | Number of Units |  | Weighted- Average Grant Date Fair Value Per Unit
| (in thousands) |  |
Non-vested, December 31, 2011 | 100 |  |  | $ | 11.15 |
Granted | 135 |  |  | $ | 10.94 |
Vested | (60 | ) |  | $ | 11.15 |
Forfeited | — |  |  | $ | — |
Non-vested, December 31, 2012 | 175 |  |  | $ | 11.00 |
Granted | 142 |  |  | $ | 14.68 |
Vested | (57 | ) |  | $ | 11.15 |
Forfeited | (35 | ) |  | $ | 10.93 |
Non-vested, December 31, 2013 | 225 |  |  | $ | 13.32 |

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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 option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 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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