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Commitments and Contingencies (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
ft²
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
ft²
Jun. 30, 2014
USD ($)
Product Warranty [Abstract]        
Period of warranty     12 months  
Change in warranty accrual [Roll Forward]        
Beginning accrued warranty and related costs $ 392 $ 1,227 $ 802 $ 1,048
Accruals for warranties issued 411 81 585 577
Adjustments related to pre-existing warranties including expirations and changes in estimates 42 (199) (252) (302)
Cost of warranty repair (177) (129) (467) 343
Ending accrued warranty and related costs $ 668 $ 980 $ 668 $ 980
Leases [Abstract]        
Area of property under long-term operating lease (in square feet) | ft² 19,467   19,467  
Term of royalty agreement     8 years  
Aggregate amount payable towards royalty $ 7,000   $ 7,000  
Outstanding contractual obligations [Abstract]        
Total 639   639  
Less than 1 year 222   222  
1-3 years 258   258  
4-5 years 54   54  
More than 5 year 105   105  
Other Commitments, Fiscal Year Maturity [Abstract]        
Total 2,764   2,764  
Less than 1 year 910   910  
1-3 years 1,408   1,408  
4-5 years 341   341  
More than 5 years 105   105  
Royalty Agreement [Member]        
Other Commitments, Fiscal Year Maturity [Abstract]        
Total 2,125   2,125  
Less than 1 year 688   688  
1-3 years 1,150   1,150  
4-5 years 287   287  
More than 5 years $ 0   $ 0