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Consolidated Balance Sheets - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Current assets:    
Cash and cash equivalents $ 1,285.1 $ 1,137.0
Short-term marketable securities 72.9 248.6
Accounts receivable, net 204.7 226.7
Inventory 101.1 70.7
Prepaid and other current assets 27.0 16.5
Total current assets 1,690.8 1,699.5
Property and equipment, net 221.4 183.1
Operating lease right-of-use assets 27.7 0.0
Goodwill 18.6 18.7
Other assets 15.5 14.7
Total assets 1,974.0 1,916.0
Current liabilities:    
Accounts payable and accrued liabilities 169.1 147.1
Accrued payroll and related expenses 51.3 72.4
Short-term portion of operating lease liabilities 12.3 0.0
Deferred revenue 2.7 2.9
Total current liabilities 235.4 222.4
Long-term senior convertible notes 1,022.4 1,010.3
Operating lease liabilities, net of current portion 29.5 0.0
Other long-term liabilities 18.1 20.0
Total liabilities 1,305.4 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 March 31, 2019 and December 31, 2018 0.0 0.0
Common stock, $0.001 par value, 200.0 million shares authorized; 92.1 million and 91.0 million shares issued and outstanding, respectively, at March 31, 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 1,590.6 1,560.6
Accumulated other comprehensive income 1.6 1.5
Accumulated deficit (823.7) (798.9)
Treasury stock, at cost; 0.8 million shares at March 31, 2019 and December 31, 2018 (100.0) (100.0)
Total stockholders’ equity 668.6 663.3
Total liabilities and stockholders’ equity $ 1,974.0 $ 1,916.0