Commitments and Contingencies (Details) (USD $)	0 Months Ended	12 Months Ended
	Feb. 25, 2011 agreement	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]
Separate representation agreements	2
Amount of non-refundable retainer under representation agreements, to be paid	$ 100,000
Potential number of warrants issued under representation agreements during 2013 and 2014		100,000
Rent expense under operating leases		1,700,000	1,900,000	1,800,000
Compensation expense related to 401(k) retirement plan		$ 600,000	$ 500,000	$ 400,000
Matching 401(k) contribution		0.00%