Consolidated Statements of Stockholders' Equity (unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Non-controlling Interest
Beginning Balance, Amount at Sep. 30, 2019	$ 244,036	$ 187	$ 664,086	$ (391)	$ (419,291)	$ (555)
Beginning Balance, Shares at Sep. 30, 2019		95,506,000
Stock-based compensation	27,510		27,510
Exercise of stock options, Amount	6,464	$ 1	6,463
Exercise of stock options, Shares		989,000
Common stock - restricted stock units vesting, Amount		$ 1	(1)
Common stock - restricted stock units vesting, Shares		1,156,000
Common stock - issued for cash, Amount	250,479	$ 5	250,474
Common stock - issued for cash, Shares		4,600,000
Foreign currency translation adjustments	216			216
Net income (loss)	(36,120)				(36,120)
Ending Balance, Amount at Jun. 30, 2020	492,585	$ 194	948,532	(175)	(455,411)	(555)
Ending Balance, Shares at Jun. 30, 2020		102,251,000
Beginning Balance, Amount at Mar. 31, 2020	493,564	$ 194	936,354	(629)	(441,800)	(555)
Beginning Balance, Shares at Mar. 31, 2020		101,748,000
Stock-based compensation	10,046		10,046
Exercise of stock options, Amount	2,133		2,133
Exercise of stock options, Shares		303,000
Common stock - restricted stock units vesting, Amount	(1)		(1)
Common stock - restricted stock units vesting, Shares		200,000
Foreign currency translation adjustments	454			454
Net income (loss)	(13,611)				(13,611)
Ending Balance, Amount at Jun. 30, 2020	492,585	$ 194	948,532	(175)	(455,411)	$ (555)
Ending Balance, Shares at Jun. 30, 2020		102,251,000
Beginning Balance, Amount at Sep. 30, 2020	461,779	$ 195	965,410	18	(503,844)
Beginning Balance, Shares at Sep. 30, 2020		102,376,000
Stock-based compensation	42,051		42,051
Exercise of stock options, Amount	$ 10,490	$ 1	10,489
Exercise of stock options, Shares	981,219	981,000
Common stock - restricted stock units vesting, Amount		$ 1	(1)
Common stock - restricted stock units vesting, Shares		852,000
Foreign currency translation adjustments	$ 44			44
Net income (loss)	(77,474)				(77,474)
Ending Balance, Amount at Jun. 30, 2021	436,890	$ 197	1,017,949	62	(581,318)
Ending Balance, Shares at Jun. 30, 2021		104,209,000
Beginning Balance, Amount at Mar. 31, 2021	445,549	$ 196	996,645	102	(551,394)
Beginning Balance, Shares at Mar. 31, 2021		104,020,000
Stock-based compensation	18,549		18,549
Exercise of stock options, Amount	2,756	$ 1	2,755
Exercise of stock options, Shares		161,000
Common stock - restricted stock units vesting, Shares		28,000
Foreign currency translation adjustments	(40)			(40)
Net income (loss)	(29,924)				(29,924)
Ending Balance, Amount at Jun. 30, 2021	$ 436,890	$ 197	$ 1,017,949	$ 62	$ (581,318)
Ending Balance, Shares at Jun. 30, 2021		104,209,000