Summary of Significant Accounting Policies - Concentration of Credit Risk, Customers, Income tax (Details) - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Concentration Risk [Line Items]
Penalties and interest accrued	$ 0	$ 0
Credit concentration
Concentration Risk [Line Items]
Term of previously protected window	3 years
Credit concentration \| Net accounts receivable \| Patient payor
Concentration Risk [Line Items]
Concentration risk percentage	10.00%
Customer concentration \| Net revenue \| Government payor
Concentration Risk [Line Items]
Concentration risk percentage	32.00%	37.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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