CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Adjustment	Common Stock	Additional Paid-in Capital	Additional Paid-in Capital Adjustment	Accumulated Other Comprehensive Loss	Accumulated Deficit	Accumulated Deficit Adjustment
Beginning balance (in shares) at Mar. 31, 2021			109,134,739
Beginning balance at Mar. 31, 2021	$ 160,504		$ 109	$ 755,643		$ (4,193)	$ (591,055)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2020-06 [Member]
Issuance of common stock under stock plans, less withholding (in shares)			6,969,809
Issuance of common stock under stock plans, less withholding	$ 15,922		$ 7	15,915
Stock-based compensation expense	132,736			132,736
Stock-based compensation expense related to Fuze acquisition (in shares)			53,498
Stock-based compensation expense related to Fuze acquisition	828			828
Forfeiture of common stock related to Wavecell acquisition (in shares)			(25,536)
Forfeiture of common stock related to Wavecell acquisition	0
Issuance of common stock related to Fuze acquisition (in shares)			4,070,355
Issuance of common stock related to Fuze acquisition	80,856		$ 4	80,852
Share repurchases (in shares)			(2,340,058)
Share repurchases	(44,976)		$ (2)	(44,974)
Equity component of convertible senior notes, net of issuance cost	15,599			15,599
Unrealized investment loss/gain	(571)					(571)
Foreign currency translation adjustment	(3,149)					(3,149)
Net loss	(175,383)						(175,383)
Ending balance (in shares) at Mar. 31, 2022			117,862,807
Ending balance at Mar. 31, 2022	182,366	$ (46,160)	$ 118	956,599	$ (92,832)	(7,913)	(766,438)	$ 46,672
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under stock plans, less withholding (in shares)			6,498,922
Issuance of common stock under stock plans, less withholding	4,685		$ 7	4,678
Stock-based compensation expense	92,065			92,065
Forfeiture of common stock related to Wavecell acquisition (in shares)			(22,311)
Forfeiture of common stock related to Wavecell acquisition	0
Repurchase of capped calls	244			244
Share repurchases (in shares)			(10,695,187)
Share repurchases	(60,214)		$ (11)	(60,203)
Shares issued for debt issuance (in shares)			1,015,024
Shares issued for debt issuance	5,085		$ 1	5,084
Dissolution of investment in foreign subsidiary	(8)						(8)
Unrealized investment loss/gain	(184)					(184)
Foreign currency translation adjustment	(4,830)					(4,830)
Net loss	$ (73,143)						(73,143)
Ending balance (in shares) at Mar. 31, 2023	114,659,255		114,659,255
Ending balance at Mar. 31, 2023	$ 99,906		$ 115	905,635		(12,927)	(792,917)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under stock plans, less withholding (in shares)			7,612,910
Issuance of common stock under stock plans, less withholding	0		$ 7	(7)
ESPP issuance (in shares)			1,883,318
ESPP issuance	4,884		$ 2	4,882
Stock-based compensation expense	63,386			63,386
Issuance of common stock under stock plans, less withholding, related to Fuze acquisition (in shares)			1,038,090
Issuance of common stock under stock plans, less withholding, related to Fuze acquisition	0		$ 1	(1)
Unrealized investment loss/gain	280					280
Foreign currency translation adjustment	1,094					1,094
Net loss	$ (67,592)						(67,592)
Ending balance (in shares) at Mar. 31, 2024	125,193,573		125,193,573
Ending balance at Mar. 31, 2024	$ 101,958		$ 125	$ 973,895		$ (11,553)	$ (860,509)