XML 74 R23.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Shared-Based Payments (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Schedule of Stock-Based Compensation Expense | The following stock-based compensation amounts were recognized for the periods indicated:
|  | Year Ended December 31, |
|  | 2013 |  |  | 2012 |  |  | 2011 |
Research and development |  | $ | 507,142 |  |  | $ | 471,809 |  |  | $ | 1,018,935 |
General and administrative |  |  | 355,020 |  |  |  | 366,586 |  |  |  | 1,328,504 |
Total stock-based compensation expense |  | $ | 862,162 |  |  | $ | 838,395 |  |  | $ | 2,347,439 |
Schedule of Fair Value Option Award Estimated on the Date of Grant Using the Black-Scholes Option-Pricing Model | The fair value of each option award is estimated on the date of grant using the Black-Scholes option-pricing model using the assumptions in the following table:
|  | Year Ended December 31,
|  | 2013 |  | 2012 |  | 2011
Expected dividend yield.. |  | 0% |  | 0% |  | 0%
Expected volatility |  | 53% - 67% |  | 51% |  | 62%
Risk-free interest rate |  | 1.24% - 2.19% |  | 1.18% |  | 1.35%
Expected term. |  | 7 years |  | 7 years |  | 7 years
Expected forfeiture rate.. |  | 5.06% - 5.57% |  | 5.57% |  | 5.58%
Schedule of Stock Option Activity | The following table summarizes stock option activity for 2013:
|  | Shares |  |  | Weighted- Average Exercise Price |  |  | Weighted-Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value (in thousands) |
Outstanding, December 31, 2012 |  |  | 3,249,541 |  |  | $ | 0.94 |  |  |  | 7.3 |  |  |  |  |
Granted |  |  | 1,307,101 |  |  |  | 10.70 |  |  |  |  |  |  |  |  |
Exercised |  |  | (1,268,049 | ) |  |  | 0.85 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (87,635 | ) |  |  | 1.11 |  |  |  |  |  |  |  |  |
Outstanding, December 31, 2013 |  |  | 3,200,958 |  |  |  | 4.90 |  |  |  | 6.9 |  |  | $ | 67,532 |
December 31, 2013: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercisable |  |  | 1,688,251 |  |  |  | 0.94 |  |  |  | 4.8 |  |  |  | 42,311 |
Vested and expected to vest |  |  | 3,022,948 |  |  |  | 4.64 |  |  |  | 6.8 |  |  |  | 64,574 |

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

X
- 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
Name: | us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration