Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 46,600	$ 202,989
Short-term investments	299,904	318,363
Accounts receivable, net of allowances of $4	7,492	911
Prepaid expenses and other current assets	3,878	10,137
Total current assets	357,874	532,400
Property and equipment, net of accumulated depreciation and amortization of $59,875 and $59,428, respectively	19,390	21,227
Goodwill	44,543	44,543
Other intangible assets	53,357	53,357
Other assets	461	433
Total assets	475,625	651,960
Current liabilities:
Accounts payable	52,877	19,725
Accrued liabilities	32,114	24,757
Current portion of deferred revenue	63,372	76,499
Current portion of long-term debt	16,280	1,976
Total current liabilities	164,643	122,957
Deferred revenue, net of current portion	48,934	109,151
Long-term debt	85,167	100,960
Deferred tax liabilities	18,675	18,675
Other long-term liabilities	805	14,367
Total liabilities	318,224	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; 104,582 and 103,860 shares issued, respectively	105	104
Additional paid-in capital	1,411,222	1,397,646
Accumulated deficit	(1,250,363)	(1,108,934)
Accumulated other comprehensive loss	(195)	(219)
Treasury stock, at cost, 306 and 237 shares, respectively	(3,368)	(2,747)
Total equity	157,401	285,850
Total liabilities and equity	$ 475,625	$ 651,960