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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 |  |

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