Business Combinations - Summary of Purchase Price Allocation (Details) - USD ($) $ in Thousands	Jan. 31, 2018	Aug. 16, 2017	Apr. 14, 2017	Dec. 31, 2018	Mar. 31, 2018
Fair value of identifiable intangible assets acquired:
Goodwill				$ 218,771	$ 218,875
Inforth Technologies, LLC
Business Acquisition [Line Items]
Initial purchase price	$ 4,000
Settlement of pre-existing net liabilities	337
Total purchase price	4,337
Fair value of the net tangible assets acquired and liabilities assumed:
Acquired cash and cash equivalents	25
Accounts receivable	6
Accrued compensation and related benefits	(49)
Other liabilities	(22)
Total net tangible assets acquired and liabilities assumed	(40)
Fair value of identifiable intangible assets acquired:
Goodwill	1,177
Total identifiable intangible assets acquired	4,377
Total purchase price	4,337
EagleDream Health
Business Acquisition [Line Items]
Initial purchase price		$ 26,000
Working capital and other adjustments		(391)
Total purchase price		25,609
Fair value of the net tangible assets acquired and liabilities assumed:
Acquired cash and cash equivalents		573
Accounts receivable		217
Prepaid expense and other current assets		20
Accounts payable		(115)
Accrued compensation and related benefits		(691)
Deferred revenues		(394)
Deferred income tax liability		(1,707)
Other liabilities		(122)
Total net tangible assets acquired and liabilities assumed		(2,219)
Fair value of identifiable intangible assets acquired:
Goodwill		14,428
Total identifiable intangible assets acquired		27,828
Total purchase price		25,609
Entrada
Business Acquisition [Line Items]
Initial purchase price			$ 34,000
Working capital and other adjustments			(42)
Total purchase price			33,958
Fair value of the net tangible assets acquired and liabilities assumed:
Acquired cash and cash equivalents			102
Accounts receivable			1,836
Prepaid expense and other current assets			145
Equipment and improvements			163
Capitalized software costs			364
Deferred income tax asset			117
Accounts payable			(639)
Accrued compensation and related benefits			(120)
Deferred revenues			(234)
Other liabilities			(444)
Total net tangible assets acquired and liabilities assumed			1,290
Fair value of identifiable intangible assets acquired:
Goodwill			17,268
Total identifiable intangible assets acquired			32,668
Total purchase price			33,958
Computer Software, Intangible Asset | Inforth Technologies, LLC
Fair value of identifiable intangible assets acquired:
Total identifiable intangible assets acquired	$ 3,200
Computer Software, Intangible Asset | EagleDream Health
Fair value of identifiable intangible assets acquired:
Total identifiable intangible assets acquired		12,800
Computer Software, Intangible Asset | Entrada
Fair value of identifiable intangible assets acquired:
Total identifiable intangible assets acquired			10,500
Customer Relationships | EagleDream Health
Fair value of identifiable intangible assets acquired:
Total identifiable intangible assets acquired		$ 600
Customer Relationships | Entrada
Fair value of identifiable intangible assets acquired:
Total identifiable intangible assets acquired			3,300
Trade Names | Entrada
Fair value of identifiable intangible assets acquired:
Total identifiable intangible assets acquired			$ 1,600