Commitments and Contingencies (Details Textual) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Commitments and Contingencies (Textual) [Abstract]
Non-cancellable operating lease expiring year	2013
Operating lease expiration period	2017
Rent expense	$ 300,000	$ 300,000	$ 300,000
Additional charges under lease for real estate taxes and common maintenance charges	10,000	30,000	300,000
Standby letter of credit amount	246,000
Letter of credit outstanding	0
Liabilities recorded for indemnification provisions		$ 0

A tax based on the assessed value of real estate by the local government. The tax is usually based on the value of property (including the land).

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 720

-SubTopic 30

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6419918&loc=d3e35301-107843

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 43

-Section A

-Paragraph 2, 17

-Chapter 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_RealEstateTaxExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration