CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' DEFICIT - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss
Beginning balance at Mar. 31, 2019	$ (199,780)	$ 360	$ 499,224	$ (697,954)	$ (1,410)
Beginning balance (in shares) at Mar. 31, 2019		36,040
Increase (Decrease) in Stockholders' Equity
Net loss	(6,122)			(6,122)
Foreign currency translation adjustments, net	(390)				(390)
Foreign currency translation adjustments, net	(390)
Shares issued under employee incentive plans, net	(170)	$ 8	(178)
Shares issued under employee stock incentive plans, net (in shares)		677
Stock-based compensation	3,352		3,352
Ending balance at Sep. 30, 2019	(203,110)	$ 368	502,398	(704,076)	(1,800)
Ending balance (in shares) at Sep. 30, 2019		36,717
Beginning balance at Jun. 30, 2019	(202,516)	$ 360	500,211	(701,761)	(1,326)
Beginning balance (in shares) at Jun. 30, 2019		36,046
Increase (Decrease) in Stockholders' Equity
Net loss	(2,315)			(2,315)
Foreign currency translation adjustments, net	(474)				(474)
Foreign currency translation adjustments, net	(474)
Shares issued under employee incentive plans, net	(170)	$ 8	(178)
Shares issued under employee stock incentive plans, net (in shares)		671
Stock-based compensation	2,365		2,365
Ending balance at Sep. 30, 2019	(203,110)	$ 368	502,398	(704,076)	(1,800)
Ending balance (in shares) at Sep. 30, 2019		36,717
Beginning balance at Mar. 31, 2020	$ (198,525)	$ 399	505,762	(703,164)	(1,522)
Beginning balance (in shares) at Mar. 31, 2020	39,905	39,905
Increase (Decrease) in Stockholders' Equity
Net loss	$ (15,328)			(15,328)
Foreign currency translation adjustments, net	1,009				1,009
Shares issued under employee stock purchase plan	539	$ 2	537
Shares issued under employee stock purchase plan (in shares)		133
Shares issued under employee incentive plans, net		$ 7	(7)
Shares issued under employee stock incentive plans, net (in shares)		702
Warrants issued related to long-term debt	11,515		11,515
Stock-based compensation	4,550		4,550
Ending balance at Sep. 30, 2020	$ (196,240)	$ 408	522,357	(718,492)	(513)
Ending balance (in shares) at Sep. 30, 2020	40,740	40,740
Beginning balance at Jun. 30, 2020	$ (195,501)	$ 399	519,235	(713,900)	(1,235)
Beginning balance (in shares) at Jun. 30, 2020		39,905
Increase (Decrease) in Stockholders' Equity
Net loss	(4,592)			(4,592)
Foreign currency translation adjustments, net	722				722
Shares issued under employee stock purchase plan	539	$ 2	537
Shares issued under employee stock purchase plan (in shares)		133
Shares issued under employee incentive plans, net		$ 7	(7)
Shares issued under employee stock incentive plans, net (in shares)		702
Stock-based compensation	2,592		2,592
Ending balance at Sep. 30, 2020	$ (196,240)	$ 408	$ 522,357	$ (718,492)	$ (513)
Ending balance (in shares) at Sep. 30, 2020	40,740	40,740