Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 53,226	$ 51,204
Marketable investment securities	122,316	129,270
Accounts receivable	31,227	41,242
Inventory	32,217	30,035
Prepaid expenses	6,003	5,621
Other current assets	1,702	1,380
Total current assets	246,691	258,752
Property and equipment, net	4,025	4,402
Goodwill	9,429	9,429
Intangibles, net	18,852	19,301
Debt issuance costs, net	312	338
Other	183	0
Total assets	279,492	292,222
Current Liabilities
Accounts payable and accrued expenses	26,908	33,117
Convertible notes payable	16,545	16,545
Current portion of non-recourse debt	7,191	8,752
Total current liabilities	50,644	58,414
Non-recourse debt, less current portion	116,520	123,635
Other liabilities	6,975	5,283
Total liabilities	174,139	187,332
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 103,284,818 shares and 102,613,780 shares, respectively	103	103
Additional paid-in capital	1,134,468	1,127,420
Accumulated other comprehensive income	47	56
Accumulated deficit	(1,029,265)	(1,022,689)
Total stockholders' equity (deficit)	105,353	104,890
Total liabilities and stockholders' equity (deficit)	$ 279,492	$ 292,222