XML 46 R16.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Stock-Based Compensation | 9 Months Ended
--- | ---
Sep. 30, 2013
Stock-Based Compensation |
Stock-Based Compensation | (11) Stock-Based Compensation A summary of stock option activity for the nine months ended September 30, 2013 is as follows:
|  | Shares |  | Weighted Average Exercise Price Per Share |  | Weighted Average Remaining Contractual Term (In Years) |
Options Outstanding at December 31, 2012 |  | 5,349,810 |  | $ | 5.98 |  | 7.0 |
Granted |  | 1,233,500 |  | $ | 16.31 |  |  |
Exercised |  | (491,165 | ) | $ | 5.83 |  |  |
Canceled |  | (14,768 | ) | $ | 7.00 |  |  |
Options Outstanding at September 30, 2013 |  | 6,077,377 |  | $ | 8.09 |  | 7.0 |
Options Vested and Expected to Vest at September 30, 2013 |  | 6,008,723 |  | $ | 8.04 |  | 7.0 |
Options Exercisable at September 30, 2013 |  | 3,435,954 |  | $ | 6.50 |  | 5.4 |
Shares Available for Grant under the 2008 Plan |  | 2,121,349 |  |  |  |  |
The weighted average grant-date fair value of stock options granted during the nine months ended September 30, 2013 was $10.47. Stock-based compensation expense for the three and nine months ended September 30, 2013 and 2012 was recorded as follows:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30, |
|  | 2013 |  | 2012 |  | 2013 |  | 2012 |
|  | (In thousands) |
Research and development |  | $ | 1,326 |  | $ | 330 |  | $ | 2,190 |  | $ | 1,010 |
General and administrative |  | 690 |  | 195 |  | 1,210 |  | 604 |
Total stock-based compensation expense |  | $ | 2,016 |  | $ | 525 |  | $ | 3,400 |  | $ | 1,614 |
The fair values of employee and director stock options granted during the three and nine months ended September 30, 2013 and 2012 were valued using the Black-Scholes option-pricing model with the following assumptions:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30, |
|  | 2013 |  | 2012 |  | 2013 |  | 2012 |
Expected stock price volatility |  | 72 | % | 71 | % | 72 | % | 70 - 71 | %
Expected option term |  | 6.0 years |  | 6.0 years |  | 6.0 years |  | 6.0 years |
Risk-free interest rate |  | 1.9 - 2.0 | % | 1.2 - 1.3 | % | 1.2 - 2.0 | % | 0.9 - 1.4 | %
Expected dividend yield |  | None |  | None |  | None |  | None |

X
- Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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 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 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 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 5: 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 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration