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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Jan. 01, 2020
Dec. 31, 2019
Summary Of Significant Accounting Policies [Line Items]        
Accumulated deficit $ (269,919) $ (214,075)   $ (260,393)
Total revenue recognized that was included in contract liability $ 1,200      
Cumulative Effect, Period Of Adoption, Adjustment        
Summary Of Significant Accounting Policies [Line Items]        
Accumulated deficit     $ 500  
Allowance for doubtful accounts     $ 500  
Zio XT service        
Summary Of Significant Accounting Policies [Line Items]        
Equipment wear period (in days) 14 days      
Period from device applied to the time the report is posted (in days) 20 days      
Revenue | Customer Concentration Risk | Federal Government Agencies        
Summary Of Significant Accounting Policies [Line Items]        
Concentration of credit risk (in percentage) 27.00% 26.00%    
Accounts Receivable | Accounts Receivable Concentration Risk | Federal Government Agencies        
Summary Of Significant Accounting Policies [Line Items]        
Concentration of credit risk (in percentage) 22.00% 18.00%