Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 45,778	$ 80,386
Short-term investments	87,367	79,666
Accounts receivable, net of allowances of $4	4,390	5,924
Inventory	4,606	4,680
Prepaid expenses and other current assets	4,686	2,668
Total current assets	146,827	173,324
Property and equipment, net of accumulated depreciation and amortization of $60,466 and $60,006, respectively	15,475	15,865
Goodwill	44,543	44,543
Other intangible assets, net of accumulated amortization of $3,678 and $3,237, respectively	49,678	50,119
Other assets	1,993	285
Total assets	258,516	284,136
Current liabilities:
Accounts payable	13,874	17,759
Accrued liabilities	10,800	14,482
Current portion of deferred revenue	2,432	3,395
Current portion of long-term debt, net of deferred issuance costs	1,115	1,115
Total current liabilities	28,221	36,751
Deferred revenue, net of current portion	24,623	23,651
Long-term debt, net of deferred issuance costs	243,912	243,887
Deferred tax liabilities	6,014	6,014
Other long-term liabilities	1,433	238
Total liabilities	304,203	310,541
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; 106,679 and 106,162 shares issued, respectively	106	106
Additional paid-in capital	1,451,365	1,447,954
Accumulated deficit	(1,493,374)	(1,471,577)
Accumulated other comprehensive loss	33	(12)
Treasury stock, at cost, 407 and 236 shares, respectively	(3,817)	(2,876)
Total equity	(45,687)	(26,405)
Total liabilities and equity	$ 258,516	$ 284,136