Business Combinations - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended		9 Months Ended
	Oct. 31, 2019	Jan. 25, 2019	Oct. 09, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2019
Business Acquisition [Line Items]
Preliminary purchase price allocation, goodwill				$ 45,112		$ 45,112		$ 41,512
Stock-based compensation expense				$ 25,950	$ 14,764	$ 70,496	$ 39,624
IOpipe, Inc.
Business Acquisition [Line Items]
Cash consideration paid	$ 5,100
Amount excluded from the aggregate purchase price	900
Preliminary purchase price allocation, goodwill	3,600
IOpipe, Inc. | Technology
Business Acquisition [Line Items]
Acquired technology	$ 1,500
Acquired technology, estimated useful life	3 years
SignifAI, Inc.
Business Acquisition [Line Items]
Cash consideration paid		$ 25,119
Amount excluded from the aggregate purchase price		12,600
Preliminary purchase price allocation, goodwill		26,178
Consideration paid		$ 36,251
Number of shares issued to acquire capital stock (in shares)		143,861
Aggregate fair value of common stock		$ 11,900
Fair value of shares issued to acquire capital stock (in usd per share)		$ 82.69
Stock-based compensation expense		$ 800
Holdback arrangement, common stock (in shares)		152,840
SignifAI, Inc. | Minimum
Business Acquisition [Line Items]
Vesting period		24 months
SignifAI, Inc. | Maximum
Business Acquisition [Line Items]
Vesting period		36 months
CoScale NV
Business Acquisition [Line Items]
Cash consideration paid			$ 6,300
Amount excluded from the aggregate purchase price			900
Preliminary purchase price allocation, goodwill			3,400
CoScale NV | Technology
Business Acquisition [Line Items]
Acquired technology			$ 2,900
Acquired technology, estimated useful life			3 years