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Revenue recognition - Balance Sheet Impacts (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Current assets:          
Cash and cash equivalents $ 223,788   $ 111,792 $ 133,011 $ 58,321
Marketable securities 72,318   79,454    
Trade receivables, net 59,383   40,394    
Inventory 13,852   10,754    
Prepaid expenses and other current assets 6,305   6,669    
Total current assets 375,646   249,063    
Fixed assets, net 8,217   8,376    
Intangible assets, net 126,290   132,993    
Deposits and other assets 1,620   1,221    
Total assets 511,773   391,653    
Current liabilities:          
Accounts payable and accrued expenses 82,534   76,446    
Current portion of long-term debt 1,666   0    
Deferred revenue 0   3,937    
Other current liabilities 2,274   1,665    
Total current liabilities 86,474   82,048    
Deferred revenue - long-term 10,540   7,954    
Long-term debt 147,204   144,971    
Other long-term liabilities 153   243    
Total liabilities 244,371   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 47   42    
Additional paid-in capital 1,105,124   966,534    
Accumulated other comprehensive income 1,855   3,969    
Accumulated deficit (839,624)   (814,108)    
Total stockholders’ equity 267,402   156,437    
Total liabilities and stockholders’ equity 511,773   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        
Prepaid expenses and other current assets 0        
Total current assets (67)        
Fixed assets, net 0        
Intangible assets, net 0        
Deposits and other assets 0        
Total assets (67)        
Current liabilities:          
Accounts payable and accrued expenses (649)        
Current portion of long-term debt 0        
Deferred revenue 4,141        
Other current liabilities 0        
Total current liabilities 3,492        
Deferred revenue - long-term 0        
Long-term debt 0        
Other long-term liabilities 0        
Total liabilities 3,492        
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 (3,559)        
Total stockholders’ equity (3,559)        
Total liabilities and stockholders’ equity (67)        
Balances without adoption of Topic 606          
Current assets:          
Cash and cash equivalents 223,788   $ 111,792    
Marketable securities 72,318        
Trade receivables, net 59,383        
Inventory 13,785        
Prepaid expenses and other current assets 6,305        
Total current assets 375,579        
Fixed assets, net 8,217        
Intangible assets, net 126,290        
Deposits and other assets 1,620        
Total assets 511,706        
Current liabilities:          
Accounts payable and accrued expenses 81,885        
Current portion of long-term debt 1,666        
Deferred revenue 4,141        
Other current liabilities 2,274        
Total current liabilities 89,966        
Deferred revenue - long-term 10,540        
Long-term debt 147,204        
Other long-term liabilities 153        
Total liabilities 247,863        
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 47        
Additional paid-in capital 1,105,124        
Accumulated other comprehensive income 1,855        
Accumulated deficit (843,183)        
Total stockholders’ equity 263,843        
Total liabilities and stockholders’ equity $ 511,706