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Consolidated Balance Sheets - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Current assets:    
Cash and cash equivalents $ 395.6 $ 1,137.0
Short-term marketable securities 1,034.3 248.6
Accounts receivable, net 234.9 226.7
Inventory 120.4 70.7
Prepaid and other current assets 30.5 16.5
Total current assets 1,815.7 1,699.5
Property and equipment, net 301.0 183.1
Operating lease right-of-use assets 34.6  
Goodwill 18.4 18.7
Other assets 16.0 14.7
Total assets 2,185.7 1,916.0
Current liabilities:    
Accounts payable and accrued liabilities 232.4 147.1
Accrued payroll and related expenses 70.9 72.4
Operating lease liabilities, current portion 14.8  
Deferred revenue 4.3 2.9
Total current liabilities 322.4 222.4
Long-term senior convertible notes 1,047.1 1,010.3
Operating lease liabilities, net of current portion 34.3  
Other long-term liabilities 17.6 20.0
Total liabilities 1,421.4 1,252.7
Commitments and contingencies
Stockholders’ equity:    
Preferred stock, $0.001 par value, 5.0 million shares authorized; no shares issued and outstanding at September 30, 2019 and December 31, 2018 0.0 0.0
Common stock, $0.001 par value, 200.0 million shares authorized; 92.3 million and 91.5 million shares issued and outstanding, respectively, at September 30, 2019; and 91.1 million and 90.0 million shares issued and outstanding, respectively, at December 31, 2018 0.1 0.1
Additional paid-in capital 1,651.6 1,560.6
Accumulated other comprehensive income 1.0 1.5
Accumulated deficit (788.4) (798.9)
Treasury stock, at cost; 0.8 million shares at September 30, 2019 and December 31, 2018 (100.0) (100.0)
Total stockholders’ equity 764.3 663.3
Total liabilities and stockholders’ equity $ 2,185.7 $ 1,916.0