Unaudited Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Cumulative adjustment due to adoption of ASU No. 2020-06	Common Stock	Additional Paid-in Capital	Additional Paid-in Capital Cumulative adjustment due to adoption of ASU No. 2020-06	Accumulated Other Comprehensive Income / (Loss)	Accumulated Deficit	Accumulated Deficit Cumulative adjustment due to adoption of ASU No. 2020-06
Balance at Jun. 30, 2020	$ 63,635		$ 91	$ 545,741		$ (484)	$ (481,713)
Balance (in shares) at Jun. 30, 2020			91,178,108
Issuance of restricted stock (in shares)			95,575
Share-based compensation	1,910			1,910
Net income (loss)	402						402
Cumulative translation adjustment	1,493					1,493
Balance at Sep. 30, 2020	67,440		$ 91	547,651		1,009	(481,311)
Balance (in shares) at Sep. 30, 2020			91,273,683
Balance at Jun. 30, 2020	63,635		$ 91	545,741		(484)	(481,713)
Balance (in shares) at Jun. 30, 2020			91,178,108
Net income (loss)	5,171
Cumulative translation adjustment	3,302
Balance at Dec. 31, 2020	77,778		$ 92	551,410		2,818	(476,542)
Balance (in shares) at Dec. 31, 2020			92,989,337
Balance at Sep. 30, 2020	67,440		$ 91	547,651		1,009	(481,311)
Balance (in shares) at Sep. 30, 2020			91,273,683
Exercise of stock options, net	66			66
Exercise of stock options, net (in shares)			17,175
Issuance of restricted stock	(343)			(343)
Issuance of restricted stock (in shares)			1,117,816
Issuance of common stock under employee stock purchase plan	1,042		$ 1	1,041
Issuance of common stock under employee stock purchase plan (in shares)			580,663
Share-based compensation	2,995			2,995
Net income (loss)	4,769						4,769
Cumulative translation adjustment	1,809					1,809
Balance at Dec. 31, 2020	77,778		$ 92	551,410		2,818	(476,542)
Balance (in shares) at Dec. 31, 2020			92,989,337
Balance at Jun. 30, 2021	$ 68,840	$ (24,784)	$ 91	554,680	$ (25,633)	2,093	(488,024)	$ 849
Balance (in shares) at Jun. 30, 2021	90,821,661		90,821,661
Issuance of restricted stock (in shares)			97,315
Share-based compensation	$ 2,506			2,506
Net income (loss)	(1,028)						(1,028)
Cumulative translation adjustment	231					231
Balance at Sep. 30, 2021	45,765		$ 91	531,553		2,324	(488,203)
Balance (in shares) at Sep. 30, 2021			90,918,976
Balance at Jun. 30, 2021	$ 68,840	$ (24,784)	$ 91	554,680	$ (25,633)	2,093	(488,024)	$ 849
Balance (in shares) at Jun. 30, 2021	90,821,661		90,821,661
Net income (loss)	$ (849)
Cumulative translation adjustment	123
Balance at Dec. 31, 2021	$ 50,994		$ 93	536,709		2,216	(488,024)
Balance (in shares) at Dec. 31, 2021	92,733,531		92,733,531
Balance at Sep. 30, 2021	$ 45,765		$ 91	531,553		2,324	(488,203)
Balance (in shares) at Sep. 30, 2021			90,918,976
Exercise of stock options, net	1,224		$ 1	1,223
Exercise of stock options, net (in shares)			331,401
Issuance of restricted stock	(258)			(258)
Issuance of restricted stock (in shares)			1,061,356
Issuance of common stock under employee stock purchase plan	1,524		$ 1	1,523
Issuance of common stock under employee stock purchase plan (in shares)			421,798
Share-based compensation	2,668			2,668
Net income (loss)	179						179
Cumulative translation adjustment	(108)					(108)
Balance at Dec. 31, 2021	$ 50,994		$ 93	$ 536,709		$ 2,216	$ (488,024)
Balance (in shares) at Dec. 31, 2021	92,733,531		92,733,531