XML 75 R35.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Stock Option Plans (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2014
Summary of Stock Option Activity for Employee and Nonemployee Awards under Plan | A summary of stock option activity for employee and nonemployee awards under the 2007 Plan and the 2014 Plan during the year ended December 31, 2014 is presented below:
|  | Number of Shares |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Life (Years) |  |  | Aggregate Intrinsic Value |
Outstanding — January 1, 2014 |  |  | 1,062,694 |  |  | $ | 3.98 |  |  |  | 7.2 |  |  | $ | 7,028 |
Granted |  |  | 1,138,170 |  |  |  | 5.99 |  |  |  |  |  |  |  |  |
Exercised |  |  | (41,566 | ) |  |  | 3.36 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (33,122 | ) |  |  | 4.85 |  |  |  |  |  |  |  |  |
Outstanding — December 31, 2014 |  |  | 2,126,176 |  |  | $ | 4.97 |  |  |  | 6.7 |  |  | $ | 2,701 |
Options expected to vest — December 31, 2014 |  |  | 859,690 |  |  | $ | 5.46 |  |  |  | 9.2 |  |  | $ | 1,105 |
Options exercisable — December 31, 2014 |  |  | 786,623 |  |  | $ | 4.41 |  |  |  | 3.9 |  |  | $ | 1,541 |
Schedule of Stock-based Compensation Expense | Stock-based compensation expense recorded as research and development and general and administrative expenses is as follows (in thousands):
|  | As of December 31, |
|  | 2014 |  |  | 2013 |  |  | 2012 |
Research and development |  | $ | 317 |  |  | $ | 284 |  |  | $ | 187 |
General and administrative |  |  | 568 |  |  |  | 338 |  |  |  | 342 |
Total |  | $ | 885 |  |  | $ | 622 |  |  | $ | 529 |
Summary of Assumptions Used in Black-Scholes Option-Pricing Model for Stock Options Granted to Employees and Non Employees | The assumptions used in the Black-Scholes option-pricing model for stock options granted to employees during the years ended December 31, 2014, 2013 and 2012 are as follows:
|  | December 31,
|  | 2014 |  | 2013 |  | 2012
Expected life |  | 6 years |  | 6 years |  | 6 years
Risk-free interest rate |  | 1.71%-2.00% |  | 1.09%-1.92% |  | 0.83%-1.12%
Expected volatility |  | 54%-60% |  | 59%-79% |  | 77%-79%
Expected dividend rate |  | —% |  | —% |  | —%
Non Employee Awards [Member] |
Summary of Assumptions Used in Black-Scholes Option-Pricing Model for Stock Options Granted to Employees and Non Employees | The Black-Scholes assumptions used to estimate the fair value of these awards for the years ended December 31, 2014, 2013 and 2012 were as follows:
|  | December 31,
|  | 2014 |  | 2013 |  | 2012
Expected life |  | 8 years |  | 7 years |  | 6 years
Risk-free interest rate |  | 1.86%-2.53% |  | 1.11%-2.86% |  | 0.99%-2.05%
Expected volatility |  | 56%-62% |  | 56%-79% |  | 76%-79%
Expected dividend rate |  | —% |  | —% |  | —%

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

X
- Details
Name: | us-gaap_AwardTypeAxis=ceru_NonEmployeeAwardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |