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Organization and Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands |  | 3 Months Ended
--- | --- | ---
Jan. 01, 2019 segment | Mar. 31, 2019 USD ($) segment | Mar. 31, 2018 USD ($)
Accounting Principle [Line Items] |  |  |
Number of Reportable Segments | segment | 1 |  |
Number of Operating Segments | segment |  | 1 |
Total revenues |  | $ 202,517 | $ 182,619
Product revenues |  |  |
Accounting Principle [Line Items] |  |  |
Total revenues |  | 145,610 | $ 130,659
Difference between Revenue Guidance in Effect before and after Topic 606 | Product revenues |  |  |
Accounting Principle [Line Items] |  |  |
Total revenues |  | $ 600 |
Lease Receivable | Customer Concentration Risk |  |  |
Accounting Principle [Line Items] |  |  |
Concentration risk percentage |  | 44.00% |

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