Commitments and Contingencies (Details Textual) (USD $)				9 Months Ended		12 Months Ended	9 Months Ended			12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011		Sep. 30, 2012 Operating Lease Expense [Member]	Sep. 30, 2011 Operating Lease Expense [Member]	Dec. 31, 2010 Operating Lease Expense [Member]	Sep. 30, 2012 Cancelable Lease Agreement [Member]	Sep. 30, 2011 Cancelable Lease Agreement [Member]	Sep. 30, 2012 Purchase Commitments [Member]	Dec. 31, 2011 Purchase Commitments [Member]
Commitments and Contingencies (Textual) [Abstract]
Rent expense				$ 1,500,000	$ 1,700,000
Tenant improvement allowance						639,000
Restricted deposits				666,000
Penalties							78,000
Motor vehicle lease expenses							1,500,000	1,400,000
Commitments purchased									3,500,000	3,000,000
Restricted deposits	$ 591,000	$ 687,000	[1]						$ 562,000

[1] The Condensed Consolidated Balance Sheet as of December 31, 2011 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.