Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 2,455	$ 46,600
Short-term investments	257,288	299,904
Accounts receivable, net of allowances of $4	8,733	7,492
Inventory	236	0
Prepaid expenses and other current assets	10,376	3,878
Total current assets	279,088	357,874
Property and equipment, net of accumulated depreciation and amortization of $60,362 and $59,875, respectively	18,995	19,390
Goodwill	44,543	44,543
Other intangible assets, net of accumulated amortization of $147 and $0, respectively	53,210	53,357
Other assets	428	461
Total assets	396,264	475,625
Current liabilities:
Accounts payable	41,945	52,877
Accrued liabilities	10,191	32,114
Current portion of deferred revenue	69,172	63,372
Current portion of long-term debt, net of deferred issuance costs	15,753	16,280
Total current liabilities	137,061	164,643
Deferred revenue, net of current portion	28,750	48,934
Long-term debt, net of deferred issuance costs	85,268	85,167
Deferred tax liabilities	10,023	18,675
Other long-term liabilities	559	805
Total liabilities	261,661	318,224
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; 105,338 and 104,582 shares issued, respectively	105	105
Additional paid-in capital	1,423,911	1,411,222
Accumulated deficit	(1,287,245)	(1,250,363)
Accumulated other comprehensive loss	(264)	(195)
Treasury stock, at cost, 122 and 306 shares, respectively	(1,904)	(3,368)
Total equity	134,603	157,401
Total liabilities and equity	$ 396,264	$ 475,625