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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Summary Of Significant Accounting Policies [Line Items]
Impairment long-lived assets			$ 0
Income tax position likely of being realized upon ultimate settlement			greater than 50%
Unrecognized tax benefits, income tax interest or penalties charge			$ 0
ASU 2014-09 | Bad Debt Expense | Contracted and Non-Contracted Claims
Summary Of Significant Accounting Policies [Line Items]
Change in net revenue due to adoption of new standard			1,700,000
ASU No. 2016-09
Summary Of Significant Accounting Policies [Line Items]
Increase in NOL related to deferred tax assets			$ 100,000
ZIO Event Card
Summary Of Significant Accounting Policies [Line Items]
Equipment wear period			30 days
Internal-Use Software
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life			5 years
Printed Circuit Board Assemblies
Summary Of Significant Accounting Policies [Line Items]
Total other assets	$ 3,500,000		$ 3,500,000		$ 2,800,000
Minimum
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful life			3 years
Maximum
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful life			5 years
Maximum | ZIO Patch Service
Summary Of Significant Accounting Policies [Line Items]
Equipment wear period			14 days
Revenue | Customer Concentration Risk | Government Agencies
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk	39.00%	38.00%	38.00%	40.00%
Accounts Receivable | Accounts Receivable Concentration Risk | Government Agencies
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk			26.00%		27.00%
Revenue Related to Non-contracted Claims
Summary Of Significant Accounting Policies [Line Items]
Revenue recognized	$ 2,500,000	$ 3,500,000	$ 8,200,000	$ 7,800,000
Contracted Revenue Recognized on Accrual Basis
Summary Of Significant Accounting Policies [Line Items]
Revenue recognized	$ 22,500,000	$ 13,300,000	$ 62,100,000	$ 37,600,000

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