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Consolidated Balance Sheets - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Current assets:    
Cash and cash equivalents $ 446.2 $ 1,137.0
Short-term marketable securities 1,087.1 248.6
Accounts receivable, net 286.3 226.7
Inventory 119.8 70.7
Prepaid and other current assets 30.0 16.5
Total current assets 1,969.4 1,699.5
Property and equipment, net 321.3 183.1
Operating lease right-of-use assets 71.5 0.0
Goodwill 18.6 18.7
Other assets 14.2 14.7
Total assets 2,395.0 1,916.0
Current liabilities:    
Accounts payable and accrued liabilities 256.4 147.1
Accrued payroll and related expenses 88.5 72.4
Operating lease liabilities, current portion 13.6 0.0
Deferred revenue 1.7 2.9
Total current liabilities 360.2 222.4
Long-term senior convertible notes 1,059.7 1,010.3
Operating lease liabilities, net of current portion 72.4 0.0
Other long-term liabilities 20.1 20.0
Total liabilities 1,512.4 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 December 31, 2019 and December 31, 2018, respectively 0.0 0.0
Common stock, $0.001 par value, 200.0 million shares authorized; 92.4 million and 91.6 million shares issued and outstanding, respectively, at December 31, 2019; 91.1 million and 90.0 million shares issued and outstanding, respectively, at December 31, 2018 0.1 0.1
Additional paid-in capital 1,675.9 1,560.6
Accumulated other comprehensive income 2.3 1.5
Accumulated deficit (695.7) (798.9)
Treasury stock at cost; 0.8 million shares at December 31, 2019 (100.0) (100.0)
Total stockholders’ equity 882.6 663.3
Total liabilities and stockholders’ equity $ 2,395.0 $ 1,916.0