Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies [Abstract]

Future Minimum Rental Commitments Under Operating Leases

Year	Operating Leases		Sublease			Net Operating Leases
2013	$	2,431	$	(295	)	$	2,136
2014		3,797		(201	)		3,596
2015		4,171		-			4,171
2016		4,271		-			4,271
2017		2,442		-			2,442
Thereafter		14,517		-			14,517
Total minimum lease payments	$	31,629	$	(496	)	$	31,133