Unaudited Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Accumulated Deficit
Beginning balance (in shares) at Jun. 30, 2018		44,834			5,806
Beginning balance at Jun. 30, 2018	$ 310,932	$ 45	$ 678,549	$ (30,633)	$ (129,914)	$ (207,115)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for employee stock purchase plan and upon exercise of stock options (in shares)		40			(126)
Issuance of common stock for employee stock purchase plan and upon exercise of stock options	3,856	$ 1	1,036		$ 2,819
Vesting of restricted stock awards (in shares)		920
Vesting of restricted stock awards	0
Stock compensation plan expense	31,978		31,978
Warrant settlements (in shares)		932
Warrant settlements	(4)	$ 1	(5)
Minimum pension liability adjustments, net of tax	(38)			(38)
Net income	5,875					5,875
Unrealized gain on available for sale securities	11			11
Change in fair value on interest rate hedging instruments	(1,952)			(1,952)
Foreign currency translation adjustments	(2,588)			(2,588)
Ending balance (in shares) at Mar. 31, 2019		46,726			5,680
Ending balance at Mar. 31, 2019	374,333	$ 47	711,558	(35,200)	$ (127,095)	(174,977)
Beginning balance (in shares) at Dec. 31, 2018		46,468			5,730
Beginning balance at Dec. 31, 2018	360,845	$ 46	700,520	(35,704)	$ (128,216)	(175,801)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for employee stock purchase plan and upon exercise of stock options (in shares)		21			(50)
Issuance of common stock for employee stock purchase plan and upon exercise of stock options	2,118	$ 1	996		$ 1,121
Vesting of restricted stock awards (in shares)		237
Vesting of restricted stock awards	0
Stock compensation plan expense	10,042		10,042
Minimum pension liability adjustments, net of tax	18			18
Net income	824					824
Unrealized gain on available for sale securities	5			5
Change in fair value on interest rate hedging instruments	(841)			(841)
Foreign currency translation adjustments	1,322			1,322
Ending balance (in shares) at Mar. 31, 2019		46,726			5,680
Ending balance at Mar. 31, 2019	374,333	$ 47	711,558	(35,200)	$ (127,095)	(174,977)
Beginning balance (in shares) at Jun. 30, 2019		46,995			5,680
Beginning balance at Jun. 30, 2019	379,377	$ 47	721,438	(43,593)	$ (127,095)	(171,420)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for employee stock purchase plan and upon exercise of stock options (in shares)		13			(123)
Issuance of common stock for employee stock purchase plan and upon exercise of stock options	4,133		1,226		$ 2,907
Vesting of restricted stock awards (in shares)		881
Vesting of restricted stock awards	1	$ 1
Repurchase of common stock to be held in treasury (in shares)					418
Repurchase of common stock to be held in treasury	(19,145)				$ (19,145)
Stock compensation plan expense	31,476		31,476
Minimum pension liability adjustments, net of tax	13			13
Net income	(6,226)					(6,226)
Unrealized gain on available for sale securities	67			67
Change in fair value on interest rate hedging instruments	(3,590)			(3,590)
Foreign currency translation adjustments	(3,248)			(3,248)
Ending balance (in shares) at Mar. 31, 2020		47,889			5,975
Ending balance at Mar. 31, 2020	382,895	$ 48	754,140	(50,351)	$ (143,333)	(177,609)
Beginning balance (in shares) at Dec. 31, 2019		47,645			5,948
Beginning balance at Dec. 31, 2019	395,934	$ 48	744,359	(37,631)	$ (140,701)	(170,141)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for employee stock purchase plan and upon exercise of stock options (in shares)					(63)
Issuance of common stock for employee stock purchase plan and upon exercise of stock options	1,958		450		$ 1,508
Vesting of restricted stock awards (in shares)		244
Vesting of restricted stock awards	0	$ 0
Repurchase of common stock to be held in treasury (in shares)					90
Repurchase of common stock to be held in treasury	(4,140)				$ (4,140)
Stock compensation plan expense	9,331		9,331
Minimum pension liability adjustments, net of tax	5			5
Net income	(7,468)					(7,468)
Unrealized gain on available for sale securities	70			70
Change in fair value on interest rate hedging instruments	(3,482)			(3,482)
Foreign currency translation adjustments	(9,313)			(9,313)
Ending balance (in shares) at Mar. 31, 2020		47,889			5,975
Ending balance at Mar. 31, 2020	$ 382,895	$ 48	$ 754,140	$ (50,351)	$ (143,333)	$ (177,609)