Credit Facility (Details Textual) (USD $)	9 Months Ended				12 Months Ended		9 Months Ended		13 Months Ended
	Sep. 30, 2012	Jun. 30, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2011 Revolving Credit Facility [Member]	Sep. 30, 2012 Revolving Credit Facility [Member]	Sep. 30, 2012 Secured Debt [Member]	Dec. 31, 2011 London Interbank Offered Rate (LIBOR) [Member] Revolving Credit Facility [Member]	Apr. 30, 2012 Equipment Term Loan [Member] Secured Debt [Member]	Jun. 30, 2013 Equipment Term Loan [Member] Secured Debt [Member]	Jun. 30, 2013 Equipment Term Loan [Member] London Interbank Offered Rate (LIBOR) [Member] Secured Debt [Member]	Dec. 31, 2011 Equipment Term Loan [Member] London Interbank Offered Rate (LIBOR) [Member] Secured Debt [Member]	Jun. 30, 2013 Collateral for Borrowing [Member]
Debt Instrument [Line Items]
Revolving line of credit					$ 15,000,000
Line of Credit Facility, Required Pledge of Equity Interests in Subsidiary, Percent				65.00%
Amounts outstanding under the Revolving Line of Credit						0
Borrowings under credit facility, interest payable description	at either (i) the bank’s prime rate or (ii) LIBOR plus 2.25%						applicable interest rate was LIBOR plus 2.25% (2.5% as of September 30, 2012)
Borrowings under credit facility, interest related to Libor rate								2.25%				2.25%
Equipment term loan number of payments									36 months
Equipment term loan, interest rate											2.50%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage					0.25%
Restricted cash		4,050,000	0										1,800,000
Long-term Debt										$ 3,200,000