Inventory - Schedule of Inventory (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Inventory Disclosure [Abstract]
Raw materials	$ 482		$ 482		$ 813
Work-in-process	1,290		1,290		89
Finished goods	1,435		1,435		1,007
Total	3,207		3,207		1,909
Current portion	(2,061)		(2,061)		(1,096)
Non-current portion included in intangible and other assets, net	1,146		1,146		$ 813
Cost of product revenue
Inventory [Line Items]
Inventory write-down	$ 200	$ 200	$ 500	$ 500