Commitments (Details) (USD $)		1 Months Ended		1 Months Ended		1 Months Ended
	Jun. 30, 2014	Nov. 30, 2010 Leased laboratory and office space located in Redwood City, California	Sep. 30, 2005 Leased laboratory and office space located in Redwood City, California sqft	Nov. 30, 2010 Leased laboratory and office space located near the leased facility in Redwood City, California	Jan. 31, 2007 Leased laboratory and office space located near the leased facility in Redwood City, California sqft	Oct. 31, 2009 Leased office space located near the leased facility in Redwood City, California sqft	Aug. 31, 2013 Second leased laboratory and office space located near the leased facility in Redwood City, California sqft	Jul. 31, 2014 Second leased laboratory and office space located near the leased facility in Redwood City, California Subsequent event sqft	May 31, 2014 Leased office space located in Geneva, Switzerland European subsidiary sqft	May 31, 2010 Leased office space located in Geneva, Switzerland European subsidiary sqft
Non-cancelable operating leases
Area leased under non-cancelable operating lease agreement (in square feet)			48,000		48,000	30,500	18,400			2,500
Period of time for which entity has an option to extend lease term		5 years		5 years		5 years	5 years
Additional area leased (in square feet)								5,500	5,000
Lease incentive obligations			$ 834,000		$ 283,000	$ 307,000	$ 276,000
Non-cancelable commitments under operating leases
2014 (remainder of year)	1,856,000
2015	3,799,000
2016	3,726,000
2017	3,706,000
2018	2,310,000
2019 and thereafter	461,000
Total minimum payments	$ 15,858,000