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Consolidated Balance Sheets - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Cash and cash equivalents $ 1,137.0 $ 441.5
Current assets:    
Short-term marketable securities 248.6 107.1
Accounts receivable, net 226.7 134.3
Inventory 70.7 45.2
Prepaid and other current assets 16.5 16.6
Total current assets 1,699.5 744.7
Property and equipment, net 183.1 145.6
Goodwill 18.7 12.1
Other assets 14.7 1.7
Total assets 1,916.0 904.1
Current liabilities:    
Accounts payable and accrued liabilities 147.1 87.2
Accrued payroll and related expenses 72.4 48.5
Deferred revenue 2.9 3.2
Total current liabilities 222.4 138.9
Other liabilities 20.0 18.2
Long-term senior convertible notes 1,010.3 327.6
Total liabilities 1,252.7 484.7
Commitments and contingencies
Stockholders’ equity:    
Preferred stock, $0.001 par value, 5.0 million shares authorized; no shares issued and outstanding at December 31, 2018 and December 31, 2017, respectively 0.0 0.0
Common stock, $0.001 par value, 200.0 million shares authorized; 91.1 million and 90.0 million shares issued and outstanding, respectively, at December 31, 2018; 87.3 million and 87.0 million shares issued and outstanding, respectively, at December 31, 2017 0.1 0.1
Additional paid-in capital 1,560.6 1,093.7
Accumulated other comprehensive income (loss) 1.5 (2.6)
Accumulated deficit (798.9) (671.8)
Treasury stock at cost; 0.8 million shares at December 31, 2018 (100.0) 0.0
Total stockholders’ equity 663.3 419.4
Total liabilities and stockholders’ equity $ 1,916.0 $ 904.1