Acquisitions - Prescribe Wellness (Details) $ in Thousands		3 Months Ended				6 Months Ended		12 Months Ended
	Mar. 05, 2019 USD ($) company	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Allocation of the purchase price based on the estimated fair values of the assets acquired and liabilities assumed
Goodwill		$ 150,922				$ 150,922		$ 108,213
Revenue		76,255		$ 48,598		137,214	$ 92,542
Net income (loss)		(6,529)	$ (10,979)	(29,026)	$ (18,094)	(17,508)	(47,120)
Amortization expense		7,084		$ 2,639		$ 11,751	$ 5,167
Trade name
Allocation of the purchase price based on the estimated fair values of the assets acquired and liabilities assumed
Weighted average amortization period						6 years 11 months 19 days		7 years 11 months 15 days
Developed technology
Allocation of the purchase price based on the estimated fair values of the assets acquired and liabilities assumed
Weighted average amortization period						8 years 1 month 6 days		7 years 2 months 8 days
Patient database
Allocation of the purchase price based on the estimated fair values of the assets acquired and liabilities assumed
Weighted average amortization period						5 years
Prescribe Wellness
Acquisition
Cash consideration	$ 150,000
Direct acquisition costs		59				$ 3,230
Purchase price consideration
Cash consideration at closing, net of post-closing adjustments						148,626
Allocation of the purchase price based on the estimated fair values of the assets acquired and liabilities assumed
Accounts receivable	2,608
Prepaid expenses and other current assets	1,345
Property and equipment	1,155
Operating lease right-of-use-assets	1,467
Goodwill	30,846
Total assets acquired	157,321
Operating lease liabilities	(1,467)
Trade accounts payable	(1,733)
Accrued expenses and other liabilities	(5,495)
Total purchase price	$ 148,626
Weighted average amortization period	11 years 4 months 24 days
Revenue		7,919				10,110
Net income (loss)		(2,925)				(3,796)
Amortization expense		3,277				4,151
Reduction to revenue recorded due to purchase accounting effects of recording deferred revenue at fair value		$ (544)				$ (747)
Prescribe Wellness | Minimum
Acquisition
Number of pharmacies with which acquiree facilitates collaboration | company	10,000
Prescribe Wellness | Trade name
Allocation of the purchase price based on the estimated fair values of the assets acquired and liabilities assumed
Intangible assets	$ 4,100
Weighted average amortization period	5 years
Prescribe Wellness | Developed technology
Allocation of the purchase price based on the estimated fair values of the assets acquired and liabilities assumed
Intangible assets	$ 20,000
Weighted average amortization period	10 years
Prescribe Wellness | Patient database
Allocation of the purchase price based on the estimated fair values of the assets acquired and liabilities assumed
Intangible assets	$ 21,700
Weighted average amortization period	5 years
Prescribe Wellness | Client relationships intangible asset
Allocation of the purchase price based on the estimated fair values of the assets acquired and liabilities assumed
Intangible assets	$ 74,100
Weighted average amortization period	14 years