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Revenue recognition - Balance Sheet Impacts (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Current assets:          
Cash and cash equivalents $ 97,675   $ 111,792 $ 54,106 $ 58,321
Marketable securities 80,595   79,454    
Trade receivables, net 45,611   40,394    
Inventory 12,355   10,754    
Prepaid expenses and other current assets 5,760   6,669    
Total current assets 241,996   249,063    
Fixed assets, net 8,302   8,376    
Intangible assets, net 127,565   132,993    
Deposits and other assets 1,548   1,221    
Total assets 379,411   391,653    
Current liabilities:          
Accounts payable and accrued expenses 71,437   76,446    
Deferred revenue 0   3,937    
Other current liabilities 1,279   1,665    
Total current liabilities 72,716   82,048    
Deferred revenue - long-term 9,300   7,954    
Long-term debt 146,878   144,971    
Other long-term liabilities 209   243    
Total liabilities 229,103   235,216    
Stockholders’ equity:          
Common stock, $0.001 par value. Authorized 125,000,000 shares; issued and outstanding 41,809,398 shares at March 31, 2018. Authorized 125,000,000 shares; issued and outstanding 41,612,395 shares at December 31, 2017 42   42    
Additional paid-in capital 975,418   966,534    
Accumulated other comprehensive income 4,953   3,969    
Accumulated deficit (830,105)   (814,108)    
Total stockholders’ equity 150,308   156,437    
Total liabilities and stockholders’ equity 379,411   391,653    
Adjustments          
Stockholders’ equity:          
Accumulated deficit   $ 3,300      
Adjustments | ASU 2014-09          
Current assets:          
Cash and cash equivalents 0   0    
Marketable securities 0        
Trade receivables, net 0        
Inventory 80        
Prepaid expenses and other current assets 0        
Total current assets 80        
Fixed assets, net 0        
Intangible assets, net 0        
Deposits and other assets 0        
Total assets 80        
Current liabilities:          
Accounts payable and accrued expenses (839)        
Deferred revenue 4,935        
Other current liabilities 0        
Total current liabilities 4,096        
Deferred revenue - long-term 0        
Long-term debt 0        
Other long-term liabilities 0        
Total liabilities 4,096        
Stockholders’ equity:          
Common stock, $0.001 par value. Authorized 125,000,000 shares; issued and outstanding 41,809,398 shares at March 31, 2018. Authorized 125,000,000 shares; issued and outstanding 41,612,395 shares at December 31, 2017 0        
Additional paid-in capital 0        
Accumulated other comprehensive income 0        
Accumulated deficit (4,016)        
Total stockholders’ equity (4,016)        
Total liabilities and stockholders’ equity 80        
Balances without adoption of Topic 606          
Current assets:          
Cash and cash equivalents 97,675   $ 111,792    
Marketable securities 80,595        
Trade receivables, net 45,611        
Inventory 12,435        
Prepaid expenses and other current assets 5,760        
Total current assets 242,076        
Fixed assets, net 8,302        
Intangible assets, net 127,565        
Deposits and other assets 1,548        
Total assets 379,491        
Current liabilities:          
Accounts payable and accrued expenses 70,598        
Deferred revenue 4,935        
Other current liabilities 1,279        
Total current liabilities 76,812        
Deferred revenue - long-term 9,300        
Long-term debt 146,878        
Other long-term liabilities 209        
Total liabilities 233,199        
Stockholders’ equity:          
Common stock, $0.001 par value. Authorized 125,000,000 shares; issued and outstanding 41,809,398 shares at March 31, 2018. Authorized 125,000,000 shares; issued and outstanding 41,612,395 shares at December 31, 2017 42        
Additional paid-in capital 975,418        
Accumulated other comprehensive income 4,953        
Accumulated deficit (834,121)        
Total stockholders’ equity 146,292        
Total liabilities and stockholders’ equity $ 379,491