Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 202,989	$ 137,266
Short-term investments, including restricted investments of $0 and $430, respectively	318,363	202,073
Accounts receivable, net of allowances of $4 and $35, respectively	911	1,035
Assets held for sale	0	23,849
Prepaid expenses and other current assets	10,137	4,764
Total current assets	532,400	368,987
Property and equipment, net of accumulated depreciation and amortization of $59,428 and $36,274, respectively	21,227	1,080
Goodwill	44,543	44,543
Other intangible assets	53,357	53,357
Other assets	3,305	3,409
Total assets	654,832	471,376
Current liabilities:
Accounts payable	19,725	13,064
Accrued liabilities	24,757	10,120
Current portion of deferred revenue	76,499	1,618
Current portion of long-term debt	2,015	20,167
Total current liabilities	122,996	44,969
Deferred revenue, net of current portion	109,151	12,679
Long-term debt	103,793	87,500
Deferred tax liabilities	18,675	18,675
Other long-term liabilities	14,367	23,535
Total liabilities	$ 368,982	$ 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; 225,000 and 128,571 shares authorized; 103,860 and 103,663 shares issued, respectively	104	104
Additional paid-in capital	1,397,646	1,390,619
Accumulated deficit	(1,108,934)	(1,104,252)
Accumulated other comprehensive loss	(219)	(63)
Treasury stock, at cost, 237 and 183 shares, respectively	(2,747)	(2,390)
Total equity	285,850	284,018
Total liabilities and equity	$ 654,832	$ 471,376