Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Current assets
Cash and cash equivalents	$ 48,973	$ 82,401
Marketable investment securities	88,741	79,832
Accounts receivable	24,149	29,532
Prepaid expenses	5,645	6,174
Other current assets	1,347	1,689
Total current assets	168,855	199,628
Equipment, net	4,506	4,346
Goodwill	9,429	9,429
Debt issuance costs, net	529	577
Total assets	183,319	213,980
Current Liabilities
Accounts payable and accrued expenses	21,555	24,336
Current portion of non-recourse debt	17,332	19,267
Total current liabilities	38,887	43,603
Convertible notes payable	16,545	16,545
Non-recourse debt, less current portion	174,436	192,085
Other liabilities	7,834	7,863
Total liabilities	237,702	260,096
Commitments and contingencies (notes 6, 8 and 9)
Stockholders' deficit
Preferred stock, $0.001 par value. Authorized 5,000,000 shares; issued and outstanding no shares	0	0
Common stock, $0.001 par value. Authorized 175,000,000 shares; issued and outstanding 86,154,205 shares and 86,081,167 shares, respectively	86	86
Additional paid-in capital	946,548	944,344
Accumulated other comprehensive loss	(4)	(96)
Accumulated deficit	(1,001,013)	(990,450)
Total stockholders' deficit	(54,383)	(46,116)
Total liabilities and stockholders' deficit	$ 183,319	$ 213,980