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Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current assets:        
Cash and cash equivalents $ 80,386 $ 61,661 $ 46,600 $ 202,989
Short-term investments 79,666 249,127    
Accounts receivable, net of allowances of $4 5,924 4,825    
Inventory 4,680 1,948    
Prepaid expenses and other current assets 2,668 4,434    
Total current assets 173,324 321,995    
Property and equipment, net of accumulated depreciation and amortization of $60,006 and $58,623, respectively 15,865 17,687    
Goodwill 44,543 44,543    
Other intangible assets 50,119 51,885    
Other assets 285 429    
Total assets 284,136 436,539    
Current liabilities:        
Accounts payable 17,759 38,762    
Accrued liabilities 14,482 12,282    
Current portion of deferred revenue 3,395 40,351    
Current portion of long-term debt, net of deferred financing costs 1,115 14,094    
Total current liabilities 36,751 105,489    
Deferred revenue, net of current portion 23,651 24,903    
Long-term debt, net of deferred financing costs 243,887 231,576    
Deferred tax liabilities 6,014 6,014    
Other long-term liabilities 238 292    
Total liabilities 310,541 368,274    
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; 106,162 and 105,711 shares issued, respectively 106 106    
Additional paid-in capital 1,447,954 1,435,526    
Accumulated deficit (1,471,577) (1,365,241)    
Accumulated other comprehensive loss (12) (222)    
Treasury stock, at cost, 236 and 122 shares, respectively (2,876) (1,904)    
Total (deficit) equity (26,405) 68,265 $ 167,507 $ 285,972
Total liabilities and (deficit) equity $ 284,136 $ 436,539