Commitments - Narrative (Details)	2 Months Ended		10 Months Ended		12 Months Ended				0 Months Ended	12 Months Ended		1 Months Ended
	Dec. 31, 2013 USD ($)	Dec. 31, 2013 GBP (£)	Oct. 31, 2013 USD ($)	Oct. 31, 2013 GBP (£)	Dec. 31, 2013 USD ($)	Dec. 31, 2013 GBP (£)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Apr. 23, 2012 Building [Member] San Diego [Member]	Dec. 31, 2013 Building [Member] San Diego [Member]	Dec. 31, 2013 Building [Member] Emeryville [Member] USD ($)	Aug. 31, 2009 Vehicles [Member] USD ($)
Operating Leased Assets [Line Items]
Base rent percent increase									3.00%		3.00%
Period uncharged										3 months	2 months
Improvement allowance											$ 305,000
Term of lease per vehicle												36 months
Lessor required letter of credit												200,000
Rent expense					829,000		828,000	826,000
Non-cancellable purchase orders outstanding	3,246,000				3,246,000
Non-cancellable purchase orders	5,218,000				5,218,000
Monthly manufacturing fee	674,000	409,000	513,000	311,000
Manufacturing fee, total					$ 18,882,000	£ 11,452,000