XML 31 R19.htm IDEA: XBRL DOCUMENT
v3.5.0.2

Stock-Based Compensation (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Schedule of Allocated Stock-Based Compensation Expense | Stock-based compensation expense was allocated to research and development and general and administrative expense as follows (in thousands):
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
Research and development |  | $ | 5,074 |  |  | $ | 4,105 |  |  | $ | 14,629 |  |  | $ | 12,761 |
General and administrative |  |  | 3,438 |  |  |  | 2,739 |  |  |  | 9,627 |  |  |  | 7,471 |
Total stock-based compensation expense |  | $ | 8,512 |  |  | $ | 6,844 |  |  | $ | 24,256 |  |  | $ | 20,232 |
Schedule of Assumptions used to Estimate Fair Value of Stock Options Granted and Purchases under 2014 Employee Share Purchase Plan | The assumptions used to estimate the fair value of stock options granted and purchases under the Company’s 2014 Employee Share Purchase Plan (“ESPP”) using the Black-Scholes option valuation model were as follows:
|  | Three Months Ended September 30, |  |  |  | Nine Months Ended September 30, |  |
|  | 2016 |  |  |  | 2015 |  |  |  | 2016 |  |  |  | 2015 |  |
Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected term (in years) |  |  | 5.3 |  |  |  |  | 5.2 |  |  |  |  | 5.3 |  |  |  |  | 5.2 |  |
Expected volatility |  |  | 73 |  | % |  |  | 70 |  | % |  |  | 70 |  | % |  |  | 70 |  | %
Risk-free interest rate |  |  | 1.2 |  |  |  |  | 1.7 |  |  |  |  | 1.4 |  |  |  |  | 1.7 |  |
Expected dividend yield |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |
Weighted average estimated fair value |  | $ | 10.73 |  |  |  | $ | 13.47 |  |  |  | $ | 11.46 |  |  |  | $ | 16.21 |  |
ESPPs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected term (in years) |  | 0.5 - 2.0 |  |  |  | 0.4 - 2.0 |  |  |  | 0.5 - 2.0 |  |  |  | 0.4 - 2.0 |  |
Expected volatility |  | 63.7 - 80.7 |  | % |  | 58.5 - 69.0 |  | % |  | 61.9 - 80.7 |  | % |  | 58.5 - 69.0 |  | %
Risk-free interest rate |  | 0.4 - 0.9 |  | % |  | 0.1 - 0.6 |  | % |  | 0.2 - 0.9 |  | % |  | 0.1 - 0.6 |  | %
Expected dividend yield |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |
Weighted average estimated fair value |  | $ | 9.04 |  |  |  | $ | 12.97 |  |  |  | $ | 10.27 |  |  |  | $ | 13.10 |  |

X
- Definition Schedule of share based payment award stock options and employee stock purchase plan valuation assumptions. + References No definition available. + Details
Name: | fgen_ScheduleOfShareBasedPaymentAwardStockOptionsAndEmployeeStockPurchasePlanValuationAssumptionsTableTextBlock
Namespace Prefix: | fgen_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + 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 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: 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 3: 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 + Details
Name: | us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration