CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data	Total USD ($)	Issuance During Period 1st [Member]	Issuance During Period 2nd [Member] USD ($)	Issuance During Period 3rd [Member]	Issuance During Period 4th [Member] USD ($)	Common Stock [Member] USD ($)	Common Stock [Member] Issuance During Period 1st [Member]	Common Stock [Member] Issuance During Period 2nd [Member] USD ($)	Common Stock [Member] Issuance During Period 3rd [Member]	Common Stock [Member] Issuance During Period 4th [Member] USD ($)	Additional Paid-in Capital [Member] USD ($)	Additional Paid-in Capital [Member] Issuance During Period 2nd [Member] USD ($)	Additional Paid-in Capital [Member] Issuance During Period 4th [Member] USD ($)	Treasury Stock [Member] USD ($)	Deficit Accumulated During the Development Stage [Member] USD ($)
Beginning Balance at Dec. 31, 2011	$ 4,666					$ 12					$ 197,769			$ (1,380)	$ (191,735)
Beginning Balance (in shares) at Dec. 31, 2011						12,470,694								112,350
Stock based option compensation	1,902										1,902
Issuance of common stock (in shares)		100	2,463,537	11,173	2,145,636		100	2,463,537	11,173	2,145,636
Issuance of common stock			10,310		23,018			3		2		10,307	23,061
Exercise of stock options to purchase common stock for cash ($1.33 to $10.88 per share)(in shares)						16,488
Exercise of stock options to purchase common stock for cash ($1.33 to $10.88 per share)	121										121
Exercise of 121,079 Series B Warrants to purchase common stock for cash @ $2.49 per share (in shares)						121,079
Exercise of 3,675 Series B Warrants to purchase common stock for cash @ $2.49 per share	301										301
Net loss	(10,123)														(10,123)
Ending Balance at Sep. 30, 2012	$ 30,195					$ 17					$ 233,416			$ (1,380)	$ (201,858)
Ending Balance (in shares) at Sep. 30, 2012						17,228,707								112,350