Debt - Additional Information (Details) (USD $)	1 Months Ended	9 Months Ended			9 Months Ended	0 Months Ended	9 Months Ended		9 Months Ended				9 Months Ended
	Feb. 28, 2013	Sep. 30, 2013	Sep. 30, 2012	Jun. 07, 2012	Sep. 30, 2013 Silicon Valley Bank [Member]	Aug. 30, 2013 Amended Credit Facilty with MidCap [Member]	Sep. 30, 2013 Amended Credit Facilty with MidCap [Member]	Jul. 30, 2013 Amended Credit Facilty with MidCap [Member]	Sep. 30, 2013 Amended Credit Facilty with MidCap [Member] Term Loan [Member]	Aug. 30, 2013 Amended Credit Facilty with MidCap [Member] Term Loan [Member]	Aug. 30, 2013 Amended Credit Facilty with MidCap [Member] Term Loan Drawn On Closing [Member]	Aug. 30, 2013 Amended Credit Facilty with MidCap [Member] Term Loan. Delayed Draw [Member]	Sep. 30, 2013 Amended Credit Facilty with MidCap [Member] Credit Facility [Member]	Aug. 30, 2013 Amended Credit Facilty with MidCap [Member] Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity				$ 50,000,000		$ 73,000,000		$ 50,000,000		$ 33,000,000	$ 28,000,000	$ 5,000,000		$ 40,000,000
Repayments of Lines of Credit		130,017,000	65,225,000			28,000,000
Interest rate description									( "LIBOR") plus 8.0%				LIBOR plus 6.0%
Debt, spread on variable rate									8.00%				6.00%
Floor on interest rate									9.50%
Interest rate of revolving line of credit									9.50%				6.20%
Term loan payments					8,100,000		300,000
Credit Facility used to pay off its existing term loan		34,300,000
Existing line of credit					17,600,000
Borrowing capacity				40,000,000
Early termination and other fees		2,300,000
Unamortized debt issuance and debt discount costs		600,000					400,000
Loss on extinguishment of debt costs			2,900,000
Up-front commitment fee		200,000
Debt issuance costs		200,000				400,000
Additional interest rate to be charged in the event of default		5.00%
Amendment fee	$ 100,000