Loan payable (Details Textual) (USD $)	3 Months Ended			1 Months Ended			3 Months Ended
	Mar. 31, 2013 Loan	Dec. 31, 2012	Mar. 31, 2013 Letter of Credit [Member]	Mar. 31, 2011 Square 1 [Member]	Mar. 31, 2013 Square 1 [Member]	Mar. 31, 2010 Square 1 [Member]	Mar. 31, 2013 First PacTrust Bankcorp [Member]	Mar. 31, 2013 First PacTrust Bankcorp [Member] Term Loan [Member]
Loan Payable (Textual) [Abstract]
Revolving line of credit in amount						$ 2,000,000
Equipment term loan in amount						2,000,000
Increased amount of line of credit availability				3,000,000
Extended maturity of revolving line				Jul. 01, 2013
Restricted Cash	1,094,000	1,343,000					1,094,000
Line of credit facility amount outstanding			758,000
Line of credit facility amount previously outstanding			500,000
Term loan								836,000
Variable interest rate					6.75%			3.75%
Maturity of term loan							Jul. 01, 2013
Loan Payable (Additional Textual) [Abstract]
No of loan secured with restricted cash	2
Outstanding term loan	$ 335,000