Commitments and Contingencies (Details)	1 Months Ended						3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Jul. 31, 2015 USD ($)	Apr. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Jan. 31, 2015 USD ($)	Nov. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) item	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)	Mar. 21, 2014 USD ($)	Jan. 31, 2013 USD ($)
Operating Leases
Restricted cash securing letter of credit	$ 1,428,000						$ 1,428,000		$ 1,428,000		$ 808,000
Future minimum lease payments
2015 (three months)	890,000						890,000		890,000
2016	2,441,000						2,441,000		2,441,000
2017	1,700,000						1,700,000		1,700,000
2018	2,118,000						2,118,000		2,118,000
2019	2,165,000						2,165,000		2,165,000
2020 and thereafter	16,260,000						16,260,000		16,260,000
Total future minimum lease payment	25,574,000						25,574,000		25,574,000
Rent expense							700,000	$ 300,000	1,800,000	$ 1,000,000
Development and approval process costs				$ 13,500,000
Inventory Material
Future minimum lease payments
Purchase commitment	6,800,000						6,800,000		6,800,000
Tests
Future minimum lease payments
Purchase commitment					$ 5,300,000
Contractual commitment period					18 months
Supplier One | Inventory Material
Future minimum lease payments
Purchase commitment	6,800,000						6,800,000		6,800,000
Supplier, Aggregate of Other
Future minimum lease payments
Purchase commitment	6,400,000						6,400,000		$ 6,400,000
Corporate Headquarters Lease
Operating Leases
Restricted cash securing letter of credit												$ 300,000	$ 800,000
Number of subleases | item									2
Redwood City Lease
Operating Leases
Monthly base rent			$ 62,700
Security deposit			$ 125,500
Austin TX, Long-term Lease
Operating Leases
Monthly base rent	133,000
Security deposit	$ 375,000						375,000		$ 375,000
Term of lease	132 months
Maximum monthly base rent after escalation	$ 207,500
Allowance for leasehold improvements	$ 7,200,000						$ 7,200,000		$ 7,200,000
Patent infringement
Future minimum lease payments
Number of judgements appealed | item									3
Third-party payer
Future minimum lease payments
Amount sought						$ 1,880,000
Settlement amount		$ 1,180,000