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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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