Subsequent Events (Narrative) (Details) (Subsequent Event [Member], USD $)	6 Months Ended
	Jun. 30, 2013
Fairfax Office [Member]
Subsequent Event [Line Items]
Operating lease, year of expiration	2019
Operating lease incentives, maximum duration of contingent free rent.	6 months
Operating lease incentives, maximum potential leasehold improvement allowance	$ 120,000
Operating lease agreement, minimum amount of time lapsed before termination right	3 years
Operating lease agreement, cancellation fee, percentage of unamortized improvements, commissions and two months rent	50.00%
Tennessee Office [Member]
Subsequent Event [Line Items]
Operating lease, year of expiration	2016