Revenue - Disaggregation (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of revenue
Revenue	$ 74,270	$ 54,418	$ 211,484	$ 146,960
MRM prescription fulfillment services
Disaggregation of revenue
Revenue	34,966	28,045	99,320	82,603
MRM services
Disaggregation of revenue
Revenue	25,810	15,467	75,010	45,821
Health plan management services
Disaggregation of revenue
Revenue	8,905	5,383	27,205	10,220
Pharmacy cost management services
Disaggregation of revenue
Revenue	4,557	5,412	9,803	8,073
Other services
Disaggregation of revenue
Revenue	$ 32	$ 111	$ 146	$ 243

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration