Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets
Cash and cash equivalents	$ 51,204	$ 17,471
Marketable investment securities	129,270	83,244
Accounts receivable	41,242	30,276
Inventory	30,035	0
Prepaid expenses	5,621	4,317
Other current assets	1,380	1,743
Total current assets	258,752	137,051
Property and equipment, net	4,402	4,193
Goodwill	9,429	9,429
Intangibles, net	19,301	0
Debt issuance costs, net	338	436
Total assets	292,222	151,109
Current Liabilities
Accounts payable	10,919	4,373
Accrued expenses and other current liabilities	17,037	9,297
Accrued research and development expenses	3,541	5,636
Accrued interest expense	1,620	3,983
Convertible notes payable	16,545	0
Current portion of non-recourse debt	8,752	6,278
Total current liabilities	58,414	29,567
Non-recourse debt, less current portion	123,635	153,024
Convertible notes payable	0	16,545
Other liabilities	5,283	6,614
Total liabilities	187,332	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 102,613,780 shares and 86,799,049 shares, respectively	103	87
Additional paid-in capital	1,127,420	954,452
Accumulated other comprehensive income	56	5
Accumulated deficit	(1,022,689)	(1,009,185)
Total stockholders' equity (deficit)	104,890	(54,641)
Total liabilities and stockholders' equity (deficit)	$ 292,222	$ 151,109