Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 38,772	$ 202,989
Short-term investments	356,784	318,363
Accounts receivable, net of allowances of $4	738	911
Prepaid expenses and other current assets	2,443	10,137
Total current assets	398,737	532,400
Property and equipment, net of accumulated depreciation and amortization of $59,367 and $59,428, respectively	19,854	21,227
Goodwill	44,543	44,543
Other intangible assets	53,357	53,357
Other assets	454	433
Total assets	516,945	651,960
Current liabilities:
Accounts payable	41,545	19,725
Accrued liabilities	32,906	24,757
Current portion of deferred revenue	78,870	76,499
Current portion of long-term debt, net of deferred issuance costs	16,792	1,976
Total current liabilities	170,113	122,957
Deferred revenue, net of current portion	55,438	109,151
Long-term debt, net of deferred issuance costs	85,038	100,960
Deferred tax liabilities	18,675	18,675
Other long-term liabilities	2,500	14,367
Total liabilities	331,764	366,110
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 shares authorized; 104,323 and 103,860 shares issued, respectively	104	104
Additional paid-in capital	1,406,311	1,397,646
Accumulated deficit	(1,217,944)	(1,108,934)
Accumulated other comprehensive gain (loss)	78	(219)
Treasury stock, at cost, 306 and 237 shares, respectively	(3,368)	(2,747)
Total equity	185,181	285,850
Total liabilities and equity	$ 516,945	$ 651,960