Commitments and Contingencies (Details) (USD $)	1 Months Ended	3 Months Ended		6 Months Ended
	Aug. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Long-term Purchase Commitment [Line Items]
Rent expense		$ 700,000	$ 900,000	$ 1,700,000	$ 1,700,000
Lease term	120 months
Recorded assets		80,478,000		80,478,000		74,390,000
Lease financing obligation		44,100,000		44,100,000		44,000,000
Lease financing obligation, current		1,000,000		1,000,000
Lease financing obligations, non-current		43,108,000		43,108,000		43,152,000
Contract manufacturer liability		1,600,000		1,600,000		1,800,000
Deposits and other assets
Long-term Purchase Commitment [Line Items]
Restricted deposits		2,300,000		2,300,000		2,300,000
Line of Credit | Letter of Credit
Long-term Purchase Commitment [Line Items]
Letter of credit		4,000,000		4,000,000
Building and improvements
Long-term Purchase Commitment [Line Items]
Recorded assets		53,400,000		53,400,000		53,300,000
Building
Long-term Purchase Commitment [Line Items]
Recorded assets		$ 35,154,000		$ 35,154,000		$ 35,154,000
Estimated useful life				30 years