Consolidated Statements of Stockholders' Equity and Comprehensive Income (Loss) (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common stock	Additional paid-in Capital	Accumulated other comprehensive income (loss)	Accumulated deficit	Comprehensive income (loss)
Balance at Dec. 31, 2008	$ (58,791)	$ 3	$ 333,862	$ 15	$ (392,671)
Balance (in shares) at Dec. 31, 2008		33,919,584
Increase (Decrease) in Stockholders' Equity
Issuance of restricted common shares (in shares)		46,216
Exercise of stock options	50		50
Exercise of stock options (in shares)		25,000
Forfeitures of restricted common shares (in shares)		(12,500)
Compensation expense related to stock options for services	4,579		4,579
Unrealized gain (loss) on marketable securities	(15)			(15)		(15)
Net income (loss)	79,088				79,088	79,088
Total Comprehensive income (loss)						79,073
Balance at Dec. 31, 2009	24,911	3	338,491		(313,583)
Balance (in shares) at Dec. 31, 2009		33,978,300
Increase (Decrease) in Stockholders' Equity
Issuance of common shares in equity offering, excluding to related parties	23,214	1	23,213
Issuance of common shares in equity offering, net (in shares)		5,616,667
Issuance of common shares to related parties	8,460		8,460
Issuance of common shares to a related party, net (in shares)		2,213,145
Issuance of restricted common shares (in shares)		180,719
Exercise of stock options	316		316
Exercise of stock options (in shares)		132,745
Forfeitures of restricted common shares (in shares)		(31,371)
Compensation expense related to stock options for services	4,048		4,048
Unrealized gain (loss) on marketable securities	(3)			(3)		(3)
Net income (loss)	(37,467)				(37,467)	(37,467)
Total Comprehensive income (loss)						(37,470)
Balance at Dec. 31, 2010	23,479	4	374,528	(3)	(351,050)
Balance (in shares) at Dec. 31, 2010	42,090,205	42,090,205
Increase (Decrease) in Stockholders' Equity
Issuance of common shares in equity offering, excluding to related parties	27,102	1	27,101
Issuance of common shares in equity offering, net (in shares)		5,610,238
Issuance of common shares to related parties	7,734		7,734
Issuance of common shares to a related party, net (in shares)		1,581,493
Issuance of restricted common shares (in shares)		70,585
Exercise of stock options	479		479
Exercise of stock options (in shares)		193,818
Forfeitures of restricted common shares (in shares)		(6,531)
Compensation expense related to stock options for services	3,354		3,354
Unrealized gain (loss) on marketable securities	6			6		6
Net income (loss)	(47,380)				(47,380)	(47,380)
Total Comprehensive income (loss)						(47,374)
Balance at Dec. 31, 2011	$ 14,774	$ 5	$ 413,196	$ 3	$ (398,430)
Balance (in shares) at Dec. 31, 2011	49,539,808	49,539,808