Acquisitions and Investments (Details) item in Thousands, $ in Thousands			1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Nov. 30, 2020 USD ($)	Jan. 27, 2020 USD ($)	Aug. 31, 2018 USD ($) item	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jun. 30, 2019 USD ($) fund	Aug. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)
Acquisition and Investments
Payment to tranches						$ 188	$ 4,114
Allocation of Purchase Price
Intangible assets, net				$ 33,712		33,712
Goodwill				240,799		240,799				$ 174,939
Deferred revenue				(2,096)		(2,096)
Working capital						3,000
Amortization expense				2,500	$ 800	4,600	1,500
Lease cost				13,943	6,338	24,236	12,294
Pro forma results
Revenues				382,911	274,293	762,518	543,223
Loss from operations				38,881	23,304	51,347	(4,851)
Net loss				25,033	$ 13,758	38,159	$ (3,085)
Issuance of convertible note						408,610
Two early stage funds
Pro forma results
Number of limited partnerships invested in | fund								2
Investment commitment								$ 13,000
Investments in limited partnerships						5,400
New Markets
Pro forma results
Investment recorded at cost				1,800		1,800
Rethink
Pro forma results
Equity method investment						3,600
Tallo
Pro forma results
Investment			$ 6,700						$ 2,300
Ownership percentage			39.50%						46.10%
Convertible note			$ 5,000
Ownership percentage on an if-converted basis			53.00%
Term of debt			48 months
Tallo | Series D Preferred shares
Pro forma results
Convertible into Series D Preferred shares | item			3,670
Tallo | Base Rate
Pro forma results
Interest rate spread added to base rate (as a percent)			0.25%
MedCerts
Acquisition and Investments
Ownership percentage acquired (as a percent)	100.00%
Total consideration	$ 70,000					70,000
Contingent consideration				10,800		10,800
Allocation of Purchase Price
Cash	225
Current assets, excluding cash	5,054
Property and equipment, net	1,896
Intangible assets, net	26,607
Goodwill	50,814
Current liabilities	(2,201)
Deferred revenue	(1,562)
Total consideration	$ 80,833
Percentage of enterprise value	49.00%
Reduced percentage	49.00%
Original purchase price	$ 34,300
Revenues of acquiree				1,000		1,000
Income (loss) of acquiree				1,200		1,200
MedCerts | Customer and distributor relationships
Allocation of Purchase Price
Intangible assets, net	$ 12,072
Estimated useful life (in years)	5 years 10 months 2 days
MedCerts | Developed technology
Allocation of Purchase Price
Intangible assets, net	$ 11,970
Estimated useful life (in years)	7 years
MedCerts | Trade names
Allocation of Purchase Price
Intangible assets, net	$ 2,565
Estimated useful life (in years)	5 years
MedCerts | Purchase Price Payable at Closing of Acquisition
Acquisition and Investments
Payment to tranches						55,000
MedCerts | Purchase Price Payable at Eighteen Month Anniversary from Closing of Acquisition
Acquisition and Investments
Payment to tranches						15,000
Tech Elevator
Acquisition and Investments
Ownership percentage acquired (as a percent)	100.00%
Total consideration	$ 23,500
Working capital	2,200
Allocation of Purchase Price
Cash	1,862
Current assets, excluding cash	469
Property and equipment, net	513
Operating lease right-of-use assets, net	724
Intangible assets, net	7,105
Goodwill	18,562
Other assets	377
Current liabilities	(1,009)
Deferred revenue	(534)
Deferred tax asset (liability)	(1,650)
Current operating lease liability	(420)
Long-term operating lease liability	(304)
Total consideration	25,695
Revenues of acquiree				600		600
Income (loss) of acquiree				300		300
Tech Elevator | Customer and distributor relationships
Allocation of Purchase Price
Intangible assets, net	$ 311
Estimated useful life (in years)	3 years 11 months 1 day
Tech Elevator | Developed technology
Allocation of Purchase Price
Intangible assets, net	$ 2,796
Estimated useful life (in years)	5 years
Tech Elevator | Trade names
Allocation of Purchase Price
Intangible assets, net	$ 3,998
Estimated useful life (in years)	15 years
Galvanize
Acquisition and Investments
Ownership percentage acquired (as a percent)		100.00%
Total consideration		$ 165,000
Working capital		9,200
Allocation of Purchase Price
Cash		9,232
Current assets, excluding cash		8,888
Property and equipment, net		11,270
Operating lease right-of-use assets, net		100,232		100,200		100,200				99,700
Intangible assets, net		68,483
Goodwill		81,225		81,200		81,200				$ 84,700
Other assets		1,802
Current liabilities		(4,370)
Deferred revenue		(3,374)
Deferred tax asset (liability)		2,372
Current operating lease liability		(11,620)
Long-term operating lease liability		(89,782)
Other long-term liabilities		(130)
Total consideration		174,228
Revenues of acquiree				9,100		17,500
Income (loss) of acquiree				$ 10,000		$ 19,700
Galvanize | Customer and distributor relationships
Allocation of Purchase Price
Intangible assets, net		$ 4,785
Estimated useful life (in years)		4 years 2 months 19 days
Galvanize | Developed technology
Allocation of Purchase Price
Intangible assets, net		$ 3,357
Estimated useful life (in years)		4 years
Galvanize | Trade names
Allocation of Purchase Price
Intangible assets, net		$ 60,341
Estimated useful life (in years)		15 years