Fair Value Measurements (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Fair value measurements
Contingent Consideration		$ 2,100,000
Earn-out paid	30,000
Reconciliation of the beginning and ending balance for the Level 3 measurement
Balance at the beginning of the period	2,033,000
Interest	32,000
Payments	(30,000)
Balance at the end of the period	2,035,000
Recurring basis | Level 3
Fair value measurements
Contingent Consideration	2,035,000	2,033,000
Recurring basis | Total
Fair value measurements
Contingent Consideration	$ 2,035,000	$ 2,033,000