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Accounting for stock-based compensation | 9 Months Ended
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Sep. 30, 2012
Accounting for stock-based compensation [Abstract] |
Accounting for stock-based compensation | 4. Accounting for stock-based compensation Total stock-based compensation expense recognized in the accompanying condensed consolidated statements of operations for the three and nine months ended September 30, 2012 and 2011 was as follows (in thousands):
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Stock-based compensation |  | $ | 3,820 |  |  | $ | 3,321 |  |  | $ | 9,770 |  |  | $ | 8,023 |
The Company issued stock awards to employees during the three months ended September 30, 2012 primarily with a four-year vesting schedule. The grant date fair value of the 1,190,600 restricted stock units and 1,798,000 stock options issued were $2.8 million and $2.7 million, respectively, with a grant date fair value per share of $2.32 and $1.54, respectively. The Company uses the Black-Scholes option valuation model to estimate the grant date fair value of employee stock options. Restricted stock units are valued based on the market price on the grant date. The Company calculated the fair value of employee stock options for the three months ended September 30, 2012 using the following assumptions:
|  | Performance-based |  | Time-based
Risk-free interest rate |  | 0.20% — 0.29% |  | 0.83%
Expected lives |  | 0.96 — 1.87 years |  | 6.08 years
Volatility |  | 62.35% — 70.56% |  | 81.81%
Dividends |  | — |  | —
As of September 30, 2012, there was $14.5 million and $12.7 million of unrecognized compensation expense related to options and restricted stock units, respectively, which are expected to be recognized over the remaining weighted average vesting period of 2.2 years. The Company evaluates stock awards with performance conditions as to the probability that the performance conditions will be met and estimates the date at which the performance conditions will be met in order to properly recognize stock-based compensation expense over the requisite service period. As of September 30, 2012, there was $107,000 and $3.7 million of unrecognized expenses related to performance-based options and restricted stock units, respectively, for milestones not considered probable of achievement.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-6 -Paragraph 53 -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 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65, A240 -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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 + Details
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