Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash Flows From Operating Activities:
Net Loss	$ (13,304)	$ (8,093)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	1,827	1,202
Depreciation	13	33
Provision for uncollectible note and interest receivables	0	763
Loss on sale of equipment	0	58
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	209	800
Deposits and other assets	(2)	33
Accounts payable	731	189
Accrued liabilities	(774)	0
Net Cash Used In Operating Activities	(11,300)	(5,015)
Cash Flows From Investing Activities:
Purchases of property and equipment	(43)	(25)
Net Cash Used In Investing Activities	(43)	(25)
Cash Flows From Financing Activities:
Proceeds from issuance of common stock for stock option exercises	4	231
Net Cash Provided By Financing Activities	4	231
Net decrease in cash	(11,339)	(4,809)
Cash at beginning of period	14,625	9,954
Cash at end of period	3,286	5,145
Supplemental disclosures of cash flow information:
Cash paid for interest	0	0
Cash paid for taxes	$ 0	$ 0