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Nature of Operations and Summary of Significant Accounting Policies (Details 2)
 3 Months Ended
Mar. 31, 2013
Equipment | Maximum
  
Estimated useful lives used to compute depreciation and amortization  
Estimated useful lives used to compute depreciation and amortization 5 years
Equipment | Minimum
  
Estimated useful lives used to compute depreciation and amortization  
Estimated useful lives used to compute depreciation and amortization 3 years
Demonstration Equipment | Maximum
  
Estimated useful lives used to compute depreciation and amortization  
Estimated useful lives used to compute depreciation and amortization 5 years
Demonstration Equipment | Minimum
  
Estimated useful lives used to compute depreciation and amortization  
Estimated useful lives used to compute depreciation and amortization 3 years
Furniture and fixtures | Maximum
  
Estimated useful lives used to compute depreciation and amortization  
Estimated useful lives used to compute depreciation and amortization 7 years
Purchased software | Maximum
  
Estimated useful lives used to compute depreciation and amortization  
Estimated useful lives used to compute depreciation and amortization 3 years
Leased equipment | Maximum
  
Estimated useful lives used to compute depreciation and amortization  
Estimated useful lives used to compute depreciation and amortization 3 years
Leasehold improvements
  
Estimated useful lives used to compute depreciation and amortization  
Leasehold improvements, estimated useful lives Shorter of 5 years or term of lease