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Consolidated Balance Sheets - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Current assets:    
Cash and cash equivalents $ 709.2 $ 1,137.0
Short-term marketable securities 668.3 248.6
Accounts receivable, net 217.3 226.7
Inventory 117.9 70.7
Prepaid and other current assets 31.5 16.5
Total current assets 1,744.2 1,699.5
Property and equipment, net 253.2 183.1
Operating lease right-of-use assets 35.8 0.0
Goodwill 18.7 18.7
Other assets 14.0 14.7
Total assets 2,065.9 1,916.0
Current liabilities:    
Accounts payable and accrued liabilities 196.7 147.1
Accrued payroll and related expenses 73.9 72.4
Operating lease liabilities, current portion 14.1 0.0
Deferred revenue 3.5 2.9
Total current liabilities 288.2 222.4
Long-term senior convertible notes 1,034.7 1,010.3
Operating lease liabilities, net of current portion 37.2 0.0
Other long-term liabilities 17.5 20.0
Total liabilities 1,377.6 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 June 30, 2019 and December 31, 2018 0.0 0.0
Common stock, $0.001 par value, 200.0 million shares authorized; 92.0 million and 91.2 million shares issued and outstanding, respectively, at June 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 1,620.4 1,560.6
Accumulated other comprehensive income 2.0 1.5
Accumulated deficit (834.2) (798.9)
Treasury stock, at cost; 0.8 million shares at June 30, 2019 and December 31, 2018 (100.0) (100.0)
Total stockholders’ equity 688.3 663.3
Total liabilities and stockholders’ equity $ 2,065.9 $ 1,916.0