Commitments (Details) (USD $)		1 Months Ended		1 Months Ended		1 Months Ended
	Mar. 31, 2013	Nov. 30, 2010 Non-cancelable operating lease agreement in September 2005	Sep. 30, 2005 Non-cancelable operating lease agreement in September 2005 sqft	Nov. 30, 2010 Non-cancelable operating lease agreement in January 2007	Jan. 31, 2007 Non-cancelable operating lease agreement in January 2007 sqft	Oct. 31, 2009 Non-cancelable operating lease agreement in October 2009 sqft	May 30, 2010 Non-cancelable operating lease agreement in May 2010 European subsidiary sqft
Non-cancelable operating leases
Area covered under non-cancelable operating lease agreement (in square feet)			48,000		48,000	30,500	2,500
Period of time for which entity has an option to extend lease term		5 years		5 years		5 years
Lease incentive obligations			$ 834,000		$ 283,000	$ 307,000
Non-cancelable commitments under operating leases
2013 (remainder of year)	2,208,000
2014	3,013,000
2015	3,030,000
2016	3,070,000
2017	3,162,000
2018 and thereafter	2,068,000
Total minimum payments	$ 16,551,000