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Revenues - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Revenue from External Customer [Line Items] |  |  |  |  |
Fees to GPOs | $ 2,800 | $ 2,200 | $ 7,600 | $ 6,200 |
Short-term deferred revenues | 88,205 |  | 88,205 |  | $ 81,835
Deferred revenues recognized | 4,800 |  | 69,800 |  |
Contract with Customer, Liability, Current, Gross |  |  |  |  | 92,900
Long-term deferred revenues | 7,979 |  | 7,979 |  | 10,582
Deferred cost of sale,short-term |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Short-term deferred revenues | $ 14,300 |  | $ 14,300 |  | $ 11,100

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130532-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 + Details
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