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Organization and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Transaction price allocated to unsatisfied performance obligation | $ 104,500,000 |  | $ 89,400,000
Transaction price allocated to unsatisfied performance obligation, current | 95,709,000 |  | $ 78,774,000
Revenue from sales-type leases | 9,800,000 | $ 3,200,000 |
Fees to GPOs | 1,900,000 | 2,100,000 |
Deferred revenue recognized | 46,600,000 |  |
Capitalized commissions | 5,600,000 | $ 4,100,000 |
Impairment loss | $ 0 |  |

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- Definition Amount of revenue recognized that was previously reported as deferred or unearned revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response)) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 + Details
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