Unaudited Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income	Accumulated Deficit
Balance at Jun. 30, 2017	$ 46,533	$ 84	$ 496,887	$ (52)	$ (450,386)
Balance (in shares) at Jun. 30, 2017		83,739,804
Issuance of restricted stock (in shares)		19,367
Retirement of common stock	(19)		(19)
Retirement of common stock (in shares)		(4,506)
Share-based compensation	2,348		2,348
Allocated transaction cost in debt issuance	8,798		8,798
Net loss	(9,382)				(9,382)
Cumulative translation adjustment	346			346
Unrealized gain on investments, net of tax	22			22
Balance at Sep. 30, 2017	48,646	$ 84	508,014	316	(459,768)
Balance (in shares) at Sep. 30, 2017		83,754,665
Balance at Jun. 30, 2017	46,533	$ 84	496,887	(52)	(450,386)
Balance (in shares) at Jun. 30, 2017		83,739,804
Net loss	(22,953)
Cumulative translation adjustment	1,467
Balance at Mar. 31, 2018	44,778	$ 86	516,173	1,858	(473,339)
Balance (in shares) at Mar. 31, 2018		85,583,802
Balance at Sep. 30, 2017	48,646	$ 84	508,014	316	(459,768)
Balance (in shares) at Sep. 30, 2017		83,754,665
Exercise of stock options, net	423		423
Exercise of Stock options, net (in shares)		105,200
Issuance of restricted stock (in shares)		1,037,044
Issuance of common stock under employee stock purchase plan	1,580	$ 1	1,579
Issuance of common stock under employee stock purchase plan (in shares)		447,756
Retirement of common stock	(274)		(274)
Retirement of common stock (in shares)		(57,030)
Share-based compensation	3,141		3,141
Net loss	(4,719)				(4,719)
Cumulative translation adjustment	212			212
Unrealized gain on investments, net of tax	102			102
Balance at Dec. 31, 2017	49,111	$ 85	512,883	630	(464,487)
Balance (in shares) at Dec. 31, 2017		85,287,635
Exercise of stock options, net	14		14
Exercise of Stock options, net (in shares)		3,600
Issuance of restricted stock		$ 1	(1)
Issuance of restricted stock (in shares)		38,738
Retirement of Convertible Senior Notes (in shares)		253,829
Share-based compensation	2,989		2,989
Allocated transaction cost in debt issuance	288		288
Net loss	(8,852)				(8,852)
Cumulative translation adjustment	909			909
Unrealized gain on investments, net of tax	319			319
Balance at Mar. 31, 2018	44,778	$ 86	516,173	1,858	(473,339)
Balance (in shares) at Mar. 31, 2018		85,583,802
Balance at Jun. 30, 2018	$ 48,632	$ 86	521,738	1,093	(474,285)
Balance (in shares) at Jun. 30, 2018	86,129,256	86,129,256
Exercise of stock options, net	$ 14		14
Exercise of Stock options, net (in shares)		3,500
Issuance of restricted stock (in shares)		367,504
Share-based compensation	2,947		2,947
Adoption of new revenue recognition standard	5,114				5,114
Net loss	(9,206)				(9,206)
Cumulative translation adjustment	(395)			(395)
Balance at Sep. 30, 2018	47,106	$ 86	524,699	698	(478,377)
Balance (in shares) at Sep. 30, 2018		86,500,260
Balance at Jun. 30, 2018	$ 48,632	$ 86	521,738	1,093	(474,285)
Balance (in shares) at Jun. 30, 2018	86,129,256	86,129,256
Net loss	$ (15,030)
Cumulative translation adjustment	(604)
Balance at Mar. 31, 2019	$ 47,644	$ 88	531,207	489	(484,140)
Balance (in shares) at Mar. 31, 2019	88,020,073	88,020,073
Balance at Sep. 30, 2018	$ 47,106	$ 86	524,699	698	(478,377)
Balance (in shares) at Sep. 30, 2018		86,500,260
Exercise of stock options, net	58		58
Exercise of Stock options, net (in shares)		14,550
Issuance of restricted stock		$ 2	(2)
Issuance of restricted stock (in shares)		1,054,539
Issuance of common stock under employee stock purchase plan	1,540		1,540
Issuance of common stock under employee stock purchase plan (in shares)		442,051
Share-based compensation	1,959		1,959
Tax withholding upon vesting of restricted stock units (in shares)		(125,797)
Adoption of new revenue recognition standard	61				61
Net loss	(4,640)				(4,640)
Cumulative translation adjustment	61			61
Balance at Dec. 31, 2018	46,145	$ 88	528,254	759	(482,956)
Balance (in shares) at Dec. 31, 2018		87,885,603
Exercise of stock options, net	417		417
Exercise of Stock options, net (in shares)		96,882
Issuance of restricted stock (in shares)		37,588
Share-based compensation	2,536		2,536
Net loss	(1,184)				(1,184)
Cumulative translation adjustment	(270)			(270)
Balance at Mar. 31, 2019	$ 47,644	$ 88	$ 531,207	$ 489	$ (484,140)
Balance (in shares) at Mar. 31, 2019	88,020,073	88,020,073