Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 41,960	$ 137,266
Short-term investments, including restricted investments of $430	273,137	202,073
Accounts receivable, net of allowances of $35	170	1,035
Assets held for sale	23,849	23,849
Prepaid expenses and other current assets	3,194	4,764
Total current assets	342,310	368,987
Property and equipment, net of accumulated depreciation and amortization of $35,899 and $36,274, respectively	732	1,080
Goodwill	44,543	44,543
Other intangible assets	53,357	53,357
Other assets	3,740	3,409
Total assets	444,682	471,376
Current liabilities:
Accounts payable	12,142	13,064
Accrued liabilities	11,769	10,120
Current portion of deferred revenue	2,311	1,618
Current portion of long-term debt	19,711	20,167
Total current liabilities	45,933	44,969
Deferred revenue, net of current portion	11,708	12,679
Long-term debt	87,500	87,500
Deferred tax liabilities	18,675	18,675
Other long-term liabilities	23,259	23,535
Total liabilities	187,075	187,358
Commitments and contingencies
Equity:
Preferred stock, $.01 par value; 5,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $.001 par value; 900,000 shares authorized; 726,807 and 725,641 shares issued, respectively	727	726
Additional paid-in capital	1,391,932	1,389,997
Accumulated deficit	(1,132,328)	(1,104,252)
Accumulated other comprehensive gain (loss)	23	(63)
Treasury stock, at cost, 1,662 and 1,281 shares, respectively	(2,747)	(2,390)
Total equity	257,607	284,018
Total liabilities and equity	$ 444,682	$ 471,376