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Consolidated Balance Sheets (unaudited) - USD ($)
$ in Thousands
Jun. 30, 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 46,680,482 shares at June 30, 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