CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (CAPITAL DEFICIENCY) (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]
Balance at Dec. 31, 2009	$ 15,883	$ 81	$ 122,252	$ (106,450)
Balance, shares at Dec. 31, 2009		80,841,237
Share-based compensation	1,282		1,282
Exercise of options granted to employees and non-employees	510		510
Exercised		407,235
Net Loss	(28,998)			(28,998)
Balance at Dec. 31, 2010	(11,323)	81	124,044	(135,448)
Balance, shares at Dec. 31, 2010		81,248,472
Common stock issued for cash (net of issuance costs) (in shares)		4,000,000
Common stock issued for cash (net of issuance costs)	20,590	4	20,586
Share-based compensation	886		886
Exercise of options granted to employees and non-employees	299	1	298
Exercised		381,685
Net Loss	(36,529)			(36,529)
Balance at Dec. 31, 2011	(26,077)	86	145,814	(171,977)
Balance, shares at Dec. 31, 2011		85,630,157
Common stock issued for cash (net of issuance costs) (in shares)		5,175,000
Common stock issued for cash (net of issuance costs)	25,388	5	25,383
Share-based compensation	4,612		4,612
Share-based compensation related to restricted stock award, net of forfeitures	3,139	1	3,138
Share-based compensation related to restricted stock award, net of forfeitures (shares)		1,496,792
Exercise of options granted to employees and non-employees	1,199	1	1,198
Exercised		1,187,860
Net Loss	(11,618)			(11,618)
Balance at Dec. 31, 2012	$ (3,357)	$ 93	$ 180,145	$ (183,595)
Balance, shares at Dec. 31, 2012		93,489,809