Share-Based Payments (Details Textual) (USD $)	6 Months Ended		12 Months Ended				12 Months Ended
	Jun. 30, 2013	Dec. 31, 2011	Dec. 31, 2011 Senior Management Employees [Member]	Dec. 31, 2011 Two Independent Directors [Member]	Dec. 31, 2011 Employees [Member]	Jun. 30, 2013 2010 Equity Incentive Plan [Member]	Dec. 31, 2011 Vest and Exercisable Condition 1 [Member] Senior Management Employees [Member]	Dec. 31, 2011 Vest and Exercisable Condition 2 [Member] Senior Management Employees [Member]
Share-based payments (Textual)
Number of Shares issuable pursuant to Equity Incentive Plan						6,000,000
Number of stock options granted			3,000,000	80,000	700,000
Contractual term of stock option			5 years	5 years	5 years
Exercise price of stock option			$ 4.20	$ 4.20	$ 4.50
Condition for stock option to vest and become exercisable				Independent directors are re-elected for successive one year terms one year after the stock options issuance date.
Grant date fair value of stock options			$ 3,300,000	$ 100,000	$ 1,300,000
Number of stock options vested				40,000			2,810,000	190,000
Cancellation of stock option granted to certain employees					600,000
Remaining stock option subject to vest and exercisable				40,000
Vesting period of stock options				1 year
Percentage of stock option vest and exercisable in year one					30.00%		30.00%	40.00%
Percentage of stock option vest and exercisable in year two					40.00%		40.00%	60.00%
Percentage of stock option vest and exercisable in year three					30.00%		30.00%
Unrecognized compensation costs related to employee stock options	400,000
Remaining weighted average service period	2 years
Exercise price of incentive stock option	Shall not be less than 100% of the fair market value of a share on the date of grant.
Term of incentive stock option	Not greater than 10 years.
Fair value of committed cash payment		400,000
Liability related to committed cash payment	$ 200,000	$ 300,000