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Organization and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Total revenues | $ 188,673,000 | $ 181,042,000 | $ 371,292,000 | $ 329,595,000 |
Deferred revenues | 94,733,000 |  | 94,733,000 |  | $ 89,397,000
Short-term deferred revenues | 85,776,000 |  | 85,776,000 |  | 78,774,000
Revenues from sales-type leases | 7,600,000 | 10,200,000 | 17,400,000 | 13,400,000 |
Fees to GPOs | 2,100,000 | 1,200,000 | 4,000,000 | 3,300,000 |
Deferred revenues recognized |  |  | 21,400,000 |  | $ 68,000,000
Capitalized commissions | 5,300,000 | 4,600,000 | 10,900,000 | 8,700,000 |
Impairment loss | 0 |  | 0 |  |
Product revenues |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Total revenues | $ 134,636,000 | 130,205,000 | $ 265,295,000 | 228,996,000 |
Difference between Revenue Guidance in Effect before and after Topic 606 | Product revenues |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Total revenues |  | $ 200,000 |  | $ 300,000 |
Lease Receivable | Customer Concentration Risk |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Concentration Risk, Percentage |  |  | 42.00% |  |

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