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Description of Business and Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Description Of Business And Significant Accounting Policies [Line Items] |  |  |
Shipping and handling revenue | $ 1,090 | $ 1,266 | $ 1,056
Payment terms for end-users | 30 days |  |
Payment terms for distributors | 60 days |  |
Depreciation | $ 7,761 | 7,655 | 4,975
Net carrying amount of loaned equipment | $ 28,749 | $ 29,995 |
Company's expense related to the medical device excise tax |  |  | $ 667
Options, restricted stock and performance based shares excluded from calculation of net loss per share | 4,321 | 4,320 | 4,255
Advertising costs | $ 900 | $ 625 | $ 476
Share-based compensation expense recognized | $ 14,615 | $ 11,697 | $ 8,997
Maximum [Member] |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |
Maturity period of short term investment | 1 year |  |

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- Definition Costs incurred and are directly related to generating advertising revenues. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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