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Description of Business and Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Description Of Business And Significant Accounting Policies [Line Items]          
Shipping and handling revenue $ 260 $ 236 $ 778 $ 699  
Payment terms for end-users     30 days    
Payment terms for distributors     60 days    
Depreciation     $ 3,304 2,405  
Net carrying amount of loaned equipment 27,455   27,455   $ 11,552
Grant income 0 231 35 731  
(Income) expense related to remeasurement of fair value of fully vested stock options 0 158 (57) 275  
Company's expense related to the medical device excise tax 164 204 $ 468 $ 434  
Options, restricted stock and performance based shares excluded from calculation of net loss per share     4,243 3,782  
Share-based compensation expense recognized 2,392 1,716 $ 6,533 $ 5,704  
Subsidiaries [Member]          
Description Of Business And Significant Accounting Policies [Line Items]          
Net foreign currency transaction (losses) gains (48) (51) $ (257) (30)  
Computer and Other Office Equipment [Member]          
Description Of Business And Significant Accounting Policies [Line Items]          
Estimated useful life by major asset category     3 years    
Generators [Member]          
Description Of Business And Significant Accounting Policies [Line Items]          
Depreciation 733 $ 593 $ 2,026 $ 1,552  
Carrying Amount of Loaned Equipment [Member]          
Description Of Business And Significant Accounting Policies [Line Items]          
Net carrying amount of loaned equipment $ 5,237   $ 5,237   $ 4,141
Short-term Debt [Member]          
Description Of Business And Significant Accounting Policies [Line Items]          
Maturity period of short term investment     1 year    
Minimum [Member] | Generators and Other Capital Equipment, Machinery, Equipment and Vehicles [Member]          
Description Of Business And Significant Accounting Policies [Line Items]          
Estimated useful life by major asset category     3 years    
Minimum [Member] | Furniture and Fixtures [Member]          
Description Of Business And Significant Accounting Policies [Line Items]          
Estimated useful life by major asset category     3 years    
Maximum [Member] | Generators and Other Capital Equipment, Machinery, Equipment and Vehicles [Member]          
Description Of Business And Significant Accounting Policies [Line Items]          
Estimated useful life by major asset category     7 years    
Maximum [Member] | Furniture and Fixtures [Member]          
Description Of Business And Significant Accounting Policies [Line Items]          
Estimated useful life by major asset category     7 years