Revenue - Disaggregation (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of revenue
Revenue	$ 76,255	$ 48,598	$ 137,214	$ 92,542
MRM prescription fulfillment services
Disaggregation of revenue
Revenue	33,372	27,378	64,354	54,558
MRM services
Disaggregation of revenue
Revenue	29,242	16,659	49,200	30,354
Health plan management services
Disaggregation of revenue
Revenue	9,317	3,132	18,300	4,837
Pharmacy cost management services
Disaggregation of revenue
Revenue	4,238	1,366	5,246	2,661
Other services
Disaggregation of revenue
Revenue	$ 86	$ 63	$ 114	$ 132

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