Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 53,368	$ 51,204
Marketable investment securities	115,979	129,270
Accounts receivable	38,125	41,242
Inventory	33,513	30,035
Prepaid expenses	6,730	5,621
Other current assets	1,206	1,380
Total current assets	248,921	258,752
Property and equipment, net	5,442	4,402
Goodwill	9,429	9,429
Intangibles, net	17,954	19,301
Other	469	338
Total assets	282,215	292,222
Current Liabilities
Accounts payable and accrued expenses	35,002	33,117
Convertible notes payable	0	16,545
Current portion of non-recourse debt	7,270	8,752
Total current liabilities	42,272	58,414
Non-recourse debt, less current portion	100,007	123,635
Other liabilities	9,023	5,283
Total liabilities	151,302	187,332
Commitments and contingencies (notes 6 and 8)
Stockholders' equity:
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 106,829,708 shares and 102,613,780 shares, respectively	107	103
Additional paid-in capital	1,161,858	1,127,420
Accumulated other comprehensive (loss) income	(1,633)	56
Accumulated deficit	(1,029,419)	(1,022,689)
Total stockholders' equity	130,913	104,890
Total liabilities and stockholders' equity	$ 282,215	$ 292,222