Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net loss	$ (2,193,000)	$ (2,059,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation	24,000
Depreciation and amortization	11,000	15,000
Interest income on short-term investments		4,000
Impairment of long-lived assets	14,000
Loss on disposal of equipment	3,000
Loss on sub-lease	685,000
Net changes in operating assets and liabilities:
Prepaid expenses and other current assets	(47,000)	989,000
Other assets	(2,000)	1,000,000
Accounts payable	173,000	(3,200,000)
Accrued expenses and other current liabilities	(274,000)	(206,000)
Income taxes payable		(644,000)
Other liabilities	45,000	(96,000)
Net cash used in operating activities	(1,561,000)	(4,197,000)
Cash flows from investing activities:
Purchases of short-term investments	(1,494,000)	(2,229,000)
Redemption of short-term investments	2,742,000	1,956,000
Purchases of restricted cash equivalents and short-term investments	(1,000,000)	(1,000,000)
Redemptions of restricted short-term investments	1,000,000
Purchases of property and equipment		(10,000)
Change in interest receivable		(1,000)
Net cash provided by (used in) investing activities	1,248,000	(1,284,000)
Cash flows from financing activities:
Proceeds from issuance of common stock through stock plans, net of repurchases		5,127,000
Distribution paid		(38,612,000)
Net cash used in financing activities		(33,485,000)
Net decrease in cash and cash equivalents	(313,000)	(38,966,000)
Cash and cash equivalents, beginning of period	31,068,000	70,326,000
Cash and cash equivalents, end of period	$ 30,755,000	$ 31,360,000