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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Current assets    
Cash and cash equivalents $ 387,520 $ 374,664
Short-term investments 381,074 93,345
Accounts receivable, net of allowance for doubtful accounts of $56 and $229 at December 31, 2019 and December 31, 2018, respectively 11,529 12,733
Prepaid expenses 10,538 4,673
Other current assets 16,606 9,510
Total current assets 807,267 494,925
Long-term investments 310,483 16,052
Property and equipment, net 87,359 59,904
Goodwill 214,513 149,524
Intangible assets, net 34,667 25,915
Right of use assets 15,931  
Other assets 18,778 14,618
Total assets 1,488,998 760,938
Current liabilities    
Accounts payable 7,362 8,177
Deferred revenue 18,780 17,418
Current operating lease liabilities 5,283  
Accrued liabilities 39,964 34,077
Total current liabilities 71,389 59,672
Long-term liabilities    
Convertible senior notes, net 900,303 283,668
Long-term operating lease liabilities 14,513  
Other long-term liabilities 3,964 6,964
Total long-term liabilities 918,780 290,632
Total liabilities 990,169 350,304
Commitments and contingencies
Stockholders' equity:    
Preferred stock, $0.001 par value – 10,000,000 shares authorized, no shares issued and outstanding at December 31, 2019 and December 31, 2018 0 0
Common stock, $0.001 par value – 400,000,000 shares authorized; 121,583,501 and 115,500,418 shares issued and outstanding at December 31, 2019 and December 31, 2018, respectively 122 116
Additional paid-in capital 916,095 818,113
Accumulated other comprehensive loss (1,096) (1,019)
Accumulated deficit (416,292) (406,576)
Total stockholders' equity 498,829 410,634
Total liabilities and stockholders' equity $ 1,488,998 $ 760,938