Debt (Details) (USD $)	3 Months Ended
	Mar. 31, 2013
LIBOR [Member] | Maturity Period of Libor 1 [Member]
Debt Instrument [Line Items]
Maturity period of loan	30 days
LIBOR [Member] | Maturity Period of Libor 2 [Member]
Debt Instrument [Line Items]
Maturity period of loan	60 days
LIBOR [Member] | Maturity Period of Libor 3 [Member]
Debt Instrument [Line Items]
Maturity period of loan	90 days
Line of Credit [Member]
Debt Instrument [Line Items]
Borrowing capacity under line of credit facility	6,000,000
Date of maturity of loan	Nov. 08, 2013
Outstanding borrowings under line of credit facility	2,700,000
Line of Credit [Member] | Prime Rate [Member]
Debt Instrument [Line Items]
Description of variable rate basis	prime lending rate
Variable interest rate (in hundredths)	3.25%
Line of Credit [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Description of variable rate basis	LIBOR
Variable interest rate (in hundredths)	2.00%
Leasehold Improvement [Member]
Debt Instrument [Line Items]
Date of maturity of loan	Mar. 31, 2014
Maturity period of loan	2 years
Term loan facility, amount	65,000
Imputed interest rate (in hundredths)	3.25%
Number of monthly installments	24
Amount under monthly payment of term loan	2,800
Unpaid balance of loan	33,000