CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance beginning at Dec. 31, 2011	$ 53,849	$ 1,175	$ 383,948	$ (329,656)	$ (2,450)	$ 832
Balance (in shares) at Dec. 31, 2011		117,480,867
Non-cash compensation cost for stock options and restricted stock	2,091	0	2,091	0	0	0
Exercise of stock options	54	1	53	0	0	0
Exercise of stock options, shares		90,534
Issuance of common stock	53,155	308	52,847	0	0	0
Issuance of common stock, shares		30,827,346
Unrealized gain (loss) on marketable securities	(402)	0	0	0	0	(402)
Net loss	(28,507)	0	0	(28,507)	0	0
Balance ending at Dec. 31, 2012	80,240	1,484	438,939	(358,163)	(2,450)	430
Balance ending (in shares) at Dec. 31, 2012		148,398,747
Non-cash compensation cost for stock options, ESPP and restricted stock	2,480	0	2,480	0	0	0
Exercise of stock options	1,498	7	1,491	0	0	0
Exercise of stock options, shares		667,867
Issuance of common stock	170,590	600	169,990	0	0	0
Issuance of common stock, shares		60,044,130
Unrealized gain (loss) on marketable securities	186	0	0	0	0	186
Foreign currency translation adjustment	223	0	0	0	0	223
Net loss	(51,983)	0	0	(51,983)	0	0
Balance ending at Dec. 31, 2013	203,234	2,091	612,900	(410,146)	(2,450)	839
Balance ending (in shares) at Dec. 31, 2013		209,110,744
Non-cash compensation cost for stock options, ESPP and restricted stock	6,090	0	6,090	0	0	0
Exercise of stock options/Purchase under ESPP	2,790	14	2,776	0	0	0
Exercise of stock options/Purchase under ESPP, shares		1,411,550
Restricted stock issued as compensation	0	0	0	0	0	0
Restricted stock issued as compensation, shares		15,000
Issuance of common stock	107,895	288	107,607	0	0	0
Issuance of common stock, shares		28,750,000
Unrealized gain (loss) on marketable securities	(680)	0	0	0	0	(680)
Foreign currency translation adjustment	(6,764)	0	0	0	0	(6,764)
Net loss	(82,947)	0	0	(82,947)	0	0
Balance ending at Dec. 31, 2014	$ 229,618	$ 2,393	$ 729,373	$ (493,093)	$ (2,450)	$ (6,605)
Balance ending (in shares) at Dec. 31, 2014		239,287,294