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Revenue recognition - Balance Sheet Impacts (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Current assets:          
Cash and cash equivalents $ 201,144 $ 169,498 $ 97,675   $ 111,792
Marketable securities 206,018 58,088      
Trade receivables, net 46,350 67,907      
Inventory, net 16,219 16,117      
Prepaid expenses and other current assets 9,348 9,247      
Total current assets 479,079 320,857      
Fixed assets, net 14,540 12,694      
Intangible assets, net 694,955 701,031      
Goodwill 82,341 82,341      
Deposits and other assets 12,996 2,299      
Total assets 1,283,911 1,119,222      
Current liabilities:          
Accounts payable and accrued expenses 98,450 128,199      
Current portion of long-term debt 16,667 11,667      
Deferred revenue 5,497 3,716      
Other current liabilities 3,132 3,814      
Total current liabilities 143,046 166,796      
Deferred revenue 8,853 9,722      
Long-term debt 138,468 141,347      
Contingent consideration payable 330,900 310,240      
Estimated fair value of deferred consideration payable 18,900 18,300      
Deferred tax liability 122,032 122,032      
Other long-term liabilities 8,770 58      
Total liabilities 770,969 768,495      
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 58 51      
Additional paid-in capital 1,523,115 1,288,137      
Accumulated other comprehensive income 805 1,462      
Accumulated deficit (1,011,036) (938,923)      
Total stockholders’ equity 512,942 350,727 $ 150,308   $ 156,437
Total liabilities and stockholders’ equity $ 1,283,911 $ 1,119,222      
Adjustments          
Stockholders’ equity:          
Accumulated deficit       $ 3,300