Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash Flows From Operating Activities:
Net Loss	$ (3,838)	$ (2,228)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	362	457
Depreciation	3	11
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	259	275
Deposits and other assets	(2)	22
Accounts payable	631	(199)
Accrued liabilities	(885)	0
Net Cash Used In Operating Activities	(3,470)	(1,662)
Cash Flows From Investing Activities:
Purchases of property and equipment	(4)	(3)
Net Cash Used In Investing Activities	(4)	(3)
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 and cash equivalents	(3,470)	(1,434)
Cash and cash equivalents at beginning of period	14,625	9,954
Cash and cash equivalents at end of period	11,155	8,520
Supplemental disclosures of cash flow information:
Cash paid for interest	0	0
Cash paid for taxes	$ 0	$ 0