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Consolidated Balance Sheets - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 367.4 $ 441.5
Short-term marketable securities 301.3 107.1
Accounts receivable, net 169.8 134.3
Inventory 55.2 45.2
Prepaid and other current assets 20.4 16.6
Total current assets 914.1 744.7
Property and equipment, net 169.6 145.6
Goodwill 18.4 12.1
Other assets 12.2 1.7
Total assets 1,114.3 904.1
Current liabilities:    
Accounts payable and accrued liabilities 135.4 87.2
Accrued payroll and related expenses 55.0 48.5
Deferred revenue 3.5 3.2
Total current liabilities 193.9 138.9
Other liabilities 19.4 18.2
Long term senior convertible notes 338.8 327.6
Total liabilities 552.1 484.7
Commitments and contingencies (Note 6)
Stockholders' equity:    
Preferred stock, $0.001 par value, 5.0 shares authorized; no shares issued and outstanding at September 30, 2018 and December 31, 2017, respectively 0.0 0.0
Common stock, $0.001 par value, 200.0 authorized; 89.1 and 88.8 issued and outstanding, respectively, at September 30, 2018; and 87.3 and 87.0 shares issued and outstanding, respectively, at December 31, 2017 0.1 0.1
Additional paid-in capital 1,181.6 1,093.7
Accumulated other comprehensive loss (0.3) (2.6)
Accumulated deficit (619.2) (671.8)
Total stockholders’ equity 562.2 419.4
Total liabilities and stockholders’ equity $ 1,114.3 $ 904.1