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Stock Incentive and Employee Stock Purchase Plans (Tables) | 12 Months Ended
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Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Share-Based Compensation Expense | For the years ended December 31, 2014, 2013 and 2012, the following table presents total share-based compensation expense in each functional line item on our consolidated statements of operations (in thousands):
| Year Ended December 31,
| 2014 |  | 2013 |  | 2012
Cost of revenues | $ | 5 |  |  | $ | 84 |  |  | $ | 747 |
Research and development | 654 |  |  | 1,114 |  |  | 3,042 |
Sales and marketing | 247 |  |  | 669 |  |  | 1,403 |
General and administrative | 2,682 |  |  | 1,576 |  |  | 2,308 |
Totals | $ | 3,588 |  |  | $ | 3,443 |  |  | $ | 7,500 |
Summary of per Share Fair Values of Stock Options Granted under 2009 Plan and Rights Granted under ESPP | The per share fair values of stock options granted under the 2009 Plan and rights granted under the ESPP have been estimated with the following assumptions.
| Employee Stock Options |  | Employee Stock Purchase Rights
| 2014 |  | 2013 |  | 2012 |  | 2014 |  | 2013 |  | 2012
Expected dividend yield: | — | % |  | — | % |  | — | % |  | — | % |  | — | % |  | — | %
Risk-free interest rate: | 1.4 | % |  | 0.8 | % |  | 0.9 | % |  | 5.4 | % |  | — | % |  | 0.2 | %
Volatility: | 80 | % |  | 63 | % |  | 63 | % |  | 53 | % |  | — | % |  | 68 | %
Expected term (in years): | 4.6 |  |  | 6 |  |  | 6 |  |  | 0.4 |  |  | 0.0 |  |  | 1.3 |
Summary of Stock Option Activity | A summary of stock option activity for the years ended December 31, 2014 and 2013 is presented below (dollars and shares in thousands, except per share data):
| Stock Options Outstanding |  | Weighted Average Exercise Price Per Option |  | Weighted Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value
Options outstanding December 31, 2012 | 4,282 |  |  | $ | 10.25 |  |  |  |  |
Granted | 425 |  |  | 2.10 |  |  |  |  |
Exercised | (38 | ) |  | 2.68 |  |  |  |  |
Cancelled | (736 | ) |  | 10.21 |  |  |  |  |
Options outstanding December 31, 2013 | 3,933 |  |  | $ | 9.45 |  |  |  |  |
Granted | 1,658 |  |  | 2.92 |  |  |  |  |
Exercised | (89 | ) |  | 2.17 |  |  |  |  |
Cancelled | (2,437 | ) |  | 10.52 |  |  |  |  |
Balance December 31, 2014 | 3,065 |  |  | $ | 5.27 |  |  | 4.92 years |  | $ | 1,022 |
Options Exercisable, December 31, 2014 | 1,769 |  |  | $ | 6.80 |  |  | 4.99 years |  | $ | 449 |
Summary of Restricted Stock Unit Activity | A summary of restricted stock unit activity for the year ended December 31, 2014 is presented below (shares in thousands):
| Shares
Non-vested at December 31, 2013 | 1,108 |
Granted | 2,659 |
Vested | (1,207 | )
Forfeited | (931 | )
Non-vested at December 31, 2014 | 1,629 |

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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(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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