The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Subsequent Events (Details) - shares	Jan. 06, 2016	Dec. 31, 2015	Dec. 31, 2014
Subsequent Event [Line Items]
Optionds vested and exercisable		993,000	968,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Optionds vested and exercisable	547,000