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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3)	12 Months Ended
	Dec. 31, 2014 item
Restricted stock awards
Stock-Based Compensation
Types of vesting schedules (in count)	3gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardTypesOfVestingSchedules / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Service-based restricted stock awards
Stock-Based Compensation
Vesting period of awards	4 years
Performance-based restricted stock awards
Stock-Based Compensation
Vesting period of awards	3 years
Market-based restricted stock awards
Stock-Based Compensation
Vesting period of awards	3 years
Stock options
Stock-Based Compensation
Vesting period of awards	4 years

X

- Definition

Represents the types of vesting schedules.

+ References

No definition available.

+ Details

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X

- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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 (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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