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Summary of Significant Accounting Policies - Additional Information (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2019 USD ($) Lease	Mar. 31, 2018 USD ($)	Dec. 31, 2018	Jan. 01, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Total revenue recognized that was included in contract liability	$ 1,200,000	$ 1,200,000
Number of embedded leases with suppliers | Lease	0
Cumulative effect adjustment				$ 0
Operating lease right-of-use assets	$ 9,232,000
Operating lease liabilities	$ 9,042,000
Topic 842
Summary Of Significant Accounting Policies [Line Items]
Operating lease right-of-use assets				10,400,000
Operating lease liabilities				$ 10,200,000
Maximum | Zio XT service
Summary Of Significant Accounting Policies [Line Items]
Equipment wear period	14 days
Revenue | Customer Concentration Risk | Federal Government Agencies
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk	35.00%	37.00%
Accounts Receivable | Accounts Receivable Concentration Risk | Federal Government Agencies
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk	19.00%		18.00%

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