Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current Assets:
Cash and cash equivalents	$ 28,441	$ 50,332
Short-term investments	6,183	45,949
Accounts receivable, net	6,819	4,341
Inventories, net	1,261	4,325
Prepaid expenses and other current assets	4,679	4,367
Total current assets	47,383	109,314
Property and equipment, net	1,702	2,050
Deferred financing costs, net	4,267	4,969
Restricted cash and other assets	2,791	2,873
Total assets	56,143	119,206
Current Liabilities:
Accounts payable	1,615	3,435
Deferred revenues	773	580
Warrant liability	1,634	2,935
Accrued interest	2,982	3,150
Other current liabilities	16,956	21,516
Total current liabilities	23,960	31,616
Convertible notes, net of discount of $22,368 at September 30, 2013 and $25,354 at December 31, 2012	100,073	97,087
Senior secured notes, net of discount of $35,283 at September 30, 2013 and $45,114 at December 31, 2012	135,658	125,827
Other liabilities	2,773	2,973
Stockholders' Deficit:
Preferred stock-$.01 par value 4,000,000 shares authorized; no shares issued
Common stock-$.01 par value 150,000,000 shares authorized; 73,627,000 shares issued and outstanding at September 30, 2013 and 73,083,000 shares issued and outstanding at December 31, 2012	737	731
Additional paid-in-capital	400,580	397,191
Accumulated deficit	(606,227)	(535,915)
Accumulated other comprehensive loss	(1,411)	(304)
Total stockholders' deficit	(206,321)	(138,297)
Total liabilities and stockholders' deficit	$ 56,143	$ 119,206