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, 2016
Dec. 31, 2015
Accounts Notes And Loans Receivable [Line Items]    
Gross accounts receivable $ 31,271 $ 26,017
Medicare    
Accounts Notes And Loans Receivable [Line Items]    
Gross accounts receivable 11,195 10,510
Medicaid Or Other Government    
Accounts Notes And Loans Receivable [Line Items]    
Gross accounts receivable 683 683
Private Insurance    
Accounts Notes And Loans Receivable [Line Items]    
Gross accounts receivable 4,970 4,852
Patient Responsibility    
Accounts Notes And Loans Receivable [Line Items]    
Gross accounts receivable 3,928 3,603
Business To Business And Other Receivables    
Accounts Notes And Loans Receivable [Line Items]    
Gross accounts receivable $ 10,495 $ 6,369