CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock and Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income [Member]
Balances at Feb. 28, 2019	$ 205,653	$ 208,541	$ (2,227)	$ (661)
Stock-based compensation expense		5,726
Shares issued on net share settlement of equity awards		(1,729)
Exercise of stock options and contributions to ESPP		995
Net loss	(16,062)		(16,062)
Foreign currency translation adjustment				(1,287)
Balances at Aug. 31, 2019	193,296	213,533	(18,289)	(1,948)
Balances at May. 31, 2019	199,112	210,962	(10,920)	(930)
Stock-based compensation expense		3,183
Shares issued on net share settlement of equity awards		(1,510)
Exercise of stock options and contributions to ESPP		898
Net loss	(7,369)		(7,369)
Foreign currency translation adjustment				(1,018)
Balances at Aug. 31, 2019	193,296	213,533	(18,289)	(1,948)
Balances at Feb. 29, 2020	137,919	220,825	(81,531)	(1,375)
Stock-based compensation expense		6,469
Shares issued on net share settlement of equity awards		(1,485)
Exercise of stock options and contributions to ESPP		909
Net loss	(23,900)		(23,900)
Foreign currency translation adjustment				(800)
Balances at Aug. 31, 2020	118,978	226,718	(105,565)	(2,175)
Balances (ASC 326 [Member]) at Aug. 31, 2020			(134)
Balances at May. 31, 2020	125,194	224,391	(96,087)	(3,110)
Stock-based compensation expense		2,846
Shares issued on net share settlement of equity awards		(1,405)
Exercise of stock options and contributions to ESPP		886
Net loss	(9,478)		(9,478)
Foreign currency translation adjustment				935
Balances at Aug. 31, 2020	$ 118,978	$ 226,718	(105,565)	$ (2,175)
Balances (ASC 326 [Member]) at Aug. 31, 2020			$ (134)