Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net loss	$ (451)	$ (737)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	5	4
Net changes in operating assets and liabilities:
Prepaid expenses and other current assets	21	(39)
Other assets		1,000
Accounts payable	(85)	(2,903)
Accrued expenses and other current liabilities	(34)	(194)
Income taxes payable		(644)
Net cash used in operating activities	(544)	(3,513)
Cash flows from investing activities:
Purchases of short-term investments	(1,494)	(736)
Redemption of short-term investments	1,493	735
Purchases of restricted cash equivalents and short-term investments	(1,000)	(1,000)
Redemptions of restricted short-term investments	1,000
Purchases of property and equipment		(6)
Change in interest receivable	4
Net cash provided by (used in) investing activities	3	(1,007)
Cash flows from financing activities:
Proceeds from issuance of common stock through stock plans, net of repurchases		5,127
Distribution paid		(38,612)
Net cash used in financing activities		(33,485)
Net decrease in cash and cash equivalents	(541)	(38,005)
Cash and cash equivalents, beginning of period	31,068	70,326
Cash and cash equivalents, end of period	$ 30,527	$ 32,321