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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2015
Summary of Significant Accounting Policies [Abstract]  
Schedule of property and equipment
    December 31,  
    2015     2014  
             
Equipment   $ 1,627     $ 1,596  
Leasehold improvements     723       1,015  
Purchased and developed software     804       242  
Furniture and fixtures     316       289  
Other depreciable assets     27       27  
Total property and equipment     3,497       3,169  
Less: accumulated depreciation and amortization     (2,605 )     (2,423 )
Net property and equipment   $ 892     $ 746
Schedule of estimated useful lives used to compute depreciation and amortization
 Equipment  3 – 5 years
 Demonstration equipment  3 – 5 years
 Furniture and fixtures  5 years
 Purchased and developed software  5 years
 Leased equipment  Shorter of 5 years or term of lease
 Leasehold improvements  Shorter of 5 years or term of lease