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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%