Commitments and Contingencies (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($) ft²	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) ft²	Jun. 30, 2015 USD ($)
Product Warranty [Abstract]
Period of warranty			12 months
Change in warranty accrual [Roll Forward]
Beginning accrued warranty and related costs	$ 431	$ 392	$ 497	$ 802
Accruals for warranties issued	4	411	23	585
Adjustments related to pre-existing warranties including expirations and changes in estimates	(64)	42	(131)	(252)
Cost of warranty repair	(41)	(177)	(59)	(467)
Ending accrued warranty and related costs	$ 330	$ 668	$ 330	$ 668
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
Outstanding contractual obligations [Abstract]
Less than 1 year	220		220
1-3 years	131		131
4-5 years	51		51
More than 5 year	73		73
Total	475		475
Other Commitments, Fiscal Year Maturity [Abstract]
Total	1,913		1,913
Less than 1 year	795		795
1-3 years	994		994
4-5 years	51		51
More than 5 years	73		73
Royalty Agreement [Member]
Other Commitments, Fiscal Year Maturity [Abstract]
Total	1,438		1,438
Less than 1 year	575		575
1-3 years	$ 863		$ 863