Commitments and Contingencies (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($) ft²	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) ft²	Sep. 30, 2015 USD ($)
Product Warranty [Abstract]
Period of warranty			12 months
Change in warranty accrual [Roll Forward]
Beginning accrued warranty and related costs	$ 330	$ 668	$ 497	$ 802
Accruals for warranties issued	3	78	26	663
Adjustments related to pre-existing warranties including expirations and changes in estimates	(57)	(4)	(188)	(256)
Cost of warranty repair	(10)	(122)	(69)	(589)
Ending accrued warranty and related costs	$ 266	$ 620	$ 266	$ 620
Leases [Abstract]
Area of property under long-term operating lease (in square feet) | ft²	19,467		19,467
Additional years per lease option			3 years
Term of royalty agreement			8 years
Aggregate amount payable towards royalty	$ 7,000		$ 7,000
Operating leases
Less than 1 year	206		206
1-3 years	91		91
4-5 years	52		52
More than 5 years	73		73
Total	422		422
Royalty agreement
Less than 1 year	575		575
1-3 years	719		719
Total	1,294		1,294
Total
Less than 1 year	781		781
1-3 years	810		810
4-5 years	52		52
More than 5 years	73		73
Total	$ 1,716		$ 1,716