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Commitments and Contingencies (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
USD ($)
ft²
Mar. 31, 2016
USD ($)
Product Warranty [Abstract]    
Period of warranty 12 months  
Change in warranty accrual [Roll Forward]    
Beginning accrued warranty and related costs $ 251 $ 497
Accruals for warranties issued 33 19
Adjustments related to pre-existing warranties including expirations and changes in estimates (105) (67)
Cost of warranty repair (46) (18)
Ending accrued warranty and related costs $ 133 $ 431
Leases [Abstract]    
Area of property under long-term operating lease (in square feet) | ft² 19,467  
Additional years per lease option 3 years  
Term of royalty agreement 8 years  
Aggregate amount payable towards royalty $ 7,000  
Operating leases    
Less than 1 year 150  
1-3 years 59  
4-5 years 49  
More than 5 years 51  
Total 309  
Royalty agreement    
Less than 1 year 575  
1-3 years 431  
Total 1,006  
Total    
Less than 1 year 725  
1-3 years 490  
4-5 years 49  
More than 5 years 51  
Total $ 1,315