Business Combinations - Preliminary Allocation of the Purchase Price to the Assets Acquired and the Liabilities Assumed By the Company (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2021	Dec. 29, 2021	Sep. 09, 2021	Dec. 31, 2020	Oct. 01, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Goodwill	$ 738,900		$ 738,900			$ 499,309		$ 336,539
Goodwill, purchase accounting adjustments			2,321
FDS Amplicare
Business Acquisition [Line Items]
Cash and cash equivalents					$ 465
Accounts receivable and unbilled receivables					5,330
Prepaid expenses					506
Other current assets					45
Total current assets					6,346
Property and equipment					444
Operating lease right-of-use assets					2,252
Goodwill					117,374
Intangible assets					70,000
Other long-term assets					51
Total assets					196,467
Accounts payable					950
Accrued compensation					1,312
Accrued liabilities					1,396
Deferred revenues					1,916
Long-term deferred tax liabilities					11,377
Long-term operating lease liabilities					920
Other long-term liabilities					130
Total liabilities					18,001
Total purchase price					178,466
Total purchase price, net of cash acquired					$ 178,001
Goodwill, purchase accounting adjustments	1,500
Increase in accounts receivable and unbilled receivables, adjustment	1,100
Increase (decrease) in noncurrent deferred tax liability, adjustment	100
Business combination, adjustment, net working capital	100
FDS Amplicare | Customer relationships
Business Acquisition [Line Items]
Increase in intangible assets, adjustment	400
ReCept
Business Acquisition [Line Items]
Cash and cash equivalents				$ 0
Accounts receivable and unbilled receivables				2,383
Prepaid expenses				192
Other current assets				13,955
Total current assets				16,530
Property and equipment				172
Operating lease right-of-use assets				773
Goodwill				81,588
Intangible assets				28,100
Other long-term assets				200
Total assets				127,363
Accounts payable				219
Accrued compensation				1,756
Accrued liabilities				18,499
Deferred revenues				222
Long-term deferred tax liabilities				3,587
Long-term operating lease liabilities				614
Other long-term liabilities				0
Total liabilities				24,897
Total purchase price				102,466
Total purchase price, net of cash acquired				$ 95,897
MarkeTouch Media
Business Acquisition [Line Items]
Cash and cash equivalents	237		237
Accounts receivable and unbilled receivables	2,302		2,302
Prepaid expenses	96		96
Other current assets	0		0
Total current assets	2,635		2,635
Property and equipment	177		177
Operating lease right-of-use assets	602		602
Goodwill	42,530		42,530
Intangible assets	38,000		38,000
Other long-term assets	2,850		2,850
Total assets	86,794		86,794
Accounts payable	473		473
Accrued compensation	0		0
Accrued liabilities	292		292
Deferred revenues	347		347
Long-term deferred tax liabilities	0		0
Long-term operating lease liabilities	206		206
Other long-term liabilities	2,850		2,850
Total liabilities	4,168		4,168
Total purchase price	82,626		82,626
Total purchase price, net of cash acquired	$ 82,389		$ 82,389
340B Link Business
Business Acquisition [Line Items]
Accounts receivable and unbilled receivables							$ 8,197
Prepaid expenses							232
Other current assets							23,040
Total current assets							31,469
Property and equipment							531
Operating lease right-of-use assets							3,138
Goodwill							160,268
Intangible assets							62,800
Total assets							258,206
Accounts payable							568
Accrued liabilities							23,715
Long-term deferred tax liabilities							6,334
Long-term operating lease liabilities							2,589
Total liabilities							33,206
Total purchase price							$ 225,000
Goodwill, purchase accounting adjustments		$ 900
Increase (decrease) in noncurrent deferred tax liability, adjustment		(500)
Increase in other current assets, adjustment		300
Decrease in accrued liabilities, adjustment		$ 100