Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Components - Additional Information (Details)

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Balance Sheet Components - Additional Information (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Customer
Jun. 30, 2015
USD ($)
Customer
Dec. 31, 2015
USD ($)
Customer
Schedule Of Balance Sheet Components [Line Items]          
Unbilled Receivables $ 5,361,000   $ 5,361,000   $ 5,155,000
Accounts Receivable Net Current $ 27,837,000   $ 27,837,000   19,872,000
Percentage of Non-US revenue invoiced in Euros 69.10% 68.00% 69.20% 42.40%  
Salvage value of expenditures for additions, improvements and replacements $ 0   $ 0    
Repairs and maintenance expense 746,000 $ 642,000 1,433,000 $ 1,212,000  
Depreciation and amortization 3,404,000 3,442,000 6,829,000 6,865,000  
Impairments of long-lived assets 0 0 0 0  
Impairment of finite lived intangible assets 0 0 0 0  
Amortization of intangible assets 22,000 $ 22,000 45,000 43,000  
Construction in Process and Computer Software or Development Cost          
Schedule Of Balance Sheet Components [Line Items]          
Depreciation and amortization     0 $ 0  
Customer Concentration Risk          
Schedule Of Balance Sheet Components [Line Items]          
Accounts Receivable Net Current $ 7,550,000   $ 7,550,000   $ 7,441,000
Sales Revenue, Net | Customer Concentration Risk          
Schedule Of Balance Sheet Components [Line Items]          
Number of customers | Customer     0 0  
Concentration risk, percentage 11.90% 19.30% 14.10% 21.00%  
Net Accounts Receivable | Customer Concentration Risk          
Schedule Of Balance Sheet Components [Line Items]          
Number of customers | Customer     1   0
Concentration risk, percentage     27.10%   37.40%
Sales Revenue, Services, Net | Customer Concentration Risk          
Schedule Of Balance Sheet Components [Line Items]          
Concentration risk, percentage 72.20% 73.10% 71.80% 72.90%  
Raw materials | Supplier Concentration Risk | Vendor one          
Schedule Of Balance Sheet Components [Line Items]          
Concentration risk, percentage     21.90% 21.60%  
Raw materials | Supplier Concentration Risk | Vendor two          
Schedule Of Balance Sheet Components [Line Items]          
Concentration risk, percentage     13.60% 17.70%  
Raw materials | Supplier Concentration Risk | Vendor three          
Schedule Of Balance Sheet Components [Line Items]          
Concentration risk, percentage     7.70% 9.60%