Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 53,307	$ 51,204
Marketable investment securities	116,175	129,270
Accounts receivable	43,186	41,242
Inventory	32,680	30,035
Prepaid expenses	6,868	5,621
Other current assets	1,579	1,380
Total current assets	253,795	258,752
Property and equipment, net	4,850	4,402
Goodwill	9,429	9,429
Intangibles, net	18,402	19,301
Debt issuance costs, net	284	338
Other	205	0
Total assets	286,965	292,222
Current Liabilities
Accounts payable and accrued expenses	33,770	33,117
Convertible notes payable	0	16,545
Current portion of non-recourse debt	9,270	8,752
Total current liabilities	43,040	58,414
Non-recourse debt, less current portion	107,477	123,635
Other liabilities	7,443	5,283
Total liabilities	157,960	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 106,559,852 shares and 102,613,780 shares, respectively	107	103
Additional paid-in capital	1,156,278	1,127,420
Accumulated other comprehensive income	(107)	56
Accumulated deficit	(1,027,273)	(1,022,689)
Total stockholders' equity	129,005	104,890
Total liabilities and stockholders' equity	$ 286,965	$ 292,222