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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 1,163,980 $ 899,509
Marketable securities—available-for-sale 274,343 270,136
Accounts receivable 307,598 266,299
Inventory 6,967 6,482
Prepaid expenses and other current assets 79,366 62,428
Total current assets 1,832,254 1,504,854
Restricted cash and investments 1,006 925
Long term investments 99,199 134,356
Inventory 3,438 7,966
Property and equipment, net 319,751 259,763
Other intangible assets, net 215,364 236,901
Goodwill 155,593 155,593
Other assets, net 19,157 2,224
Total assets 2,645,762 2,302,582
Current liabilities:    
Accounts payable 103,827 67,671
Accrued compensation 60,176 74,550
Interest payable 29 33
Accrued and other current liabilities 229,401 198,901
Convertible senior notes   7,393
Acquisition-related contingent consideration 31,844 26,848
Total current liabilities 425,277 375,396
Convertible senior notes 17,434 16,608
Acquisition-related contingent consideration 255,157 260,152
Other liabilities 21,927 19,797
Total liabilities 719,795 671,953
Stockholders' equity:    
Preferred stock, $0.001 par value; 5,000,000 shares authorized; none issued or outstanding as of December 31, 2018 and December 31, 2017
Common stock, $0.001 par value; 400,000,000 shares authorized; 213,274,660 and 211,262,906 shares issued and outstanding as of December 31, 2018 and December 31, 2017, respectively 213 211
Additional paid-in capital 3,813,678 3,627,433
Accumulated other comprehensive loss (10,165) (7,010)
Accumulated deficit (1,877,759) (1,990,005)
Total stockholders' equity 1,925,967 1,630,629
Total liabilities and stockholders' equity $ 2,645,762 $ 2,302,582