Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets
Cash and cash equivalents	$ 70,188	$ 17,471
Marketable investment securities	110,334	83,244
Accounts receivable	33,795	30,276
Inventory	27,125	0
Prepaid expenses	4,412	4,317
Other current assets	1,655	1,743
Total current assets	247,509	137,051
Property and equipment, net	3,963	4,193
Goodwill	9,429	9,429
Intangibles, net	20,198	0
Debt issuance costs, net	386	436
Total assets	281,485	151,109
Current Liabilities
Accounts payable and accrued expenses	27,794	23,289
Current portion of non-recourse debt	7,603	6,278
Total current liabilities	35,397	29,567
Convertible notes payable	16,545	16,545
Non-recourse debt, less current portion	139,032	153,024
Other liabilities	5,455	6,614
Total liabilities	196,429	205,750
Commitments and contingencies (notes 6 and 8)
Stockholders' equity (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 101,340,451 shares and 86,799,049 shares, respectively	101	87
Additional paid-in capital	1,114,386	954,452
Accumulated other comprehensive (loss) income	(61)	5
Accumulated deficit	(1,029,370)	(1,009,185)
Total stockholders' equity (deficit)	85,056	(54,641)
Total liabilities and stockholders' equity (deficit)	$ 281,485	$ 151,109