STOCKHOLDERS' EQUITY (Details) (USD $)	0 Months Ended
Mar. 31, 2015	Mar. 31, 2015
STOCKHOLDERS' EQUITY
Number of warrants exercised	235,000gern_NumberOfWarrantsExercised
Exercise price of warrants issued (in dollars per share)		$ 3.75
Proceeds from exercise of warrants	$ 881,000us-gaap_ProceedsFromWarrantExercises

Exercise price per share or per unit of warrants or rights outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i)(4))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant