CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current Assets:
Cash and cash equivalents	$ 36,141	$ 50,332
Short-term investments	32,648	45,949
Accounts receivable, net	3,824	4,341
Inventories, net	2,381	4,325
Prepaid expenses and other current assets	5,510	4,367
Total current assets	80,504	109,314
Property and equipment, net	1,916	2,050
Deferred financing costs, net	4,740	4,969
Restricted cash and other assets	2,898	2,873
Total assets	90,058	119,206
Current Liabilities:
Accounts payable	2,509	3,435
Deferred revenues	299	580
Warrant liability	2,190	2,935
Accrued interest	2,978	3,150
Other current liabilities	14,115	21,516
Total current liabilities	22,091	31,616
Convertible notes, net of discount of $24,383 at March 31, 2013 and $25,354 at December 31, 2012	98,058	97,087
Senior secured notes, net of discount of $41,955 at March 31, 2013 and $45,114 at December 31, 2012	128,986	125,827
Other liabilities	2,908	2,973
Stockholders' Deficit:
Preferred stock-$.01 par value 4,000,000 shares authorized; no shares issued
Common stock-$.01 par value 150,000,000 shares authorized; 73,871,000 shares issued and outstanding at March 31, 2013 and 73,083,000 shares issued and outstanding at December 31, 2012	739	731
Additional paid-in-capital	398,282	397,191
Accumulated deficit	(560,361)	(535,915)
Accumulated other comprehensive loss	(645)	(304)
Total stockholders' deficit	(161,985)	(138,297)
Total liabilities and stockholders' deficit	$ 90,058	$ 119,206