Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Components - Schedule of Gross Accounts Receivable Balance Concentrations by Major Category (Details)

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Balance Sheet Components - Schedule of Gross Accounts Receivable Balance Concentrations by Major Category (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Accounts Notes And Loans Receivable [Line Items]    
Gross accounts receivable $ 38,493 $ 39,360
Medicare    
Accounts Notes And Loans Receivable [Line Items]    
Gross accounts receivable 10,583 12,500
Medicaid Or Other Government    
Accounts Notes And Loans Receivable [Line Items]    
Gross accounts receivable 564 617
Private Insurance    
Accounts Notes And Loans Receivable [Line Items]    
Gross accounts receivable 2,740 3,475
Patient Responsibility    
Accounts Notes And Loans Receivable [Line Items]    
Gross accounts receivable 3,898 3,227
Business To Business And Other Receivables    
Accounts Notes And Loans Receivable [Line Items]    
Gross accounts receivable $ 20,708 $ 19,541