Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current Assets:
Cash and cash equivalents	$ 38,343	$ 50,332
Short-term investments	13,131	45,949
Accounts receivable, net	7,753	4,341
Inventories, net	1,575	4,325
Prepaid expenses and other current assets	3,819	4,367
Total current assets	64,621	109,314
Property and equipment, net	1,804	2,050
Deferred financing costs, net	4,505	4,969
Restricted cash and other assets	2,827	2,873
Total assets	73,757	119,206
Current Liabilities:
Accounts payable	3,425	3,435
Deferred revenues	1,480	580
Warrant liability	1,438	2,935
Accrued interest	3,154	3,150
Other current liabilities	16,719	21,516
Total current liabilities	26,216	31,616
Convertible notes, net of discount of $23,388 at June 30, 2013 and $25,354 at December 31, 2012	99,053	97,087
Senior secured notes, net of discount of $38,670 at June 30, 2013 and $45,114 at December 31, 2012	132,271	125,827
Other liabilities	2,839	2,973
Stockholders' Deficit:
Preferred stock-$.01 par value 4,000,000 shares authorized; no shares issued
Common stock-$.01 par value 150,000,000 shares authorized; 73,709,000 shares issued and outstanding at June 30, 2013 and 73,083,000 shares issued and outstanding at December 31, 2012	737	731
Additional paid-in-capital	399,340	397,191
Accumulated deficit	(585,793)	(535,915)
Accumulated other comprehensive loss	(906)	(304)
Total stockholders' deficit	(186,622)	(138,297)
Total liabilities and stockholders' deficit	$ 73,757	$ 119,206