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Consolidated Balance Sheets - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 300.2 $ 441.5
Short-term marketable securities 305.9 107.1
Accounts receivable, net 162.0 134.3
Inventory 46.2 45.2
Prepaid and other current assets 21.7 16.6
Total current assets 836.0 744.7
Property and equipment, net 156.8 145.6
Goodwill 11.9 12.1
Other assets 2.8 1.7
Total assets 1,007.5 904.1
Current liabilities:    
Accounts payable and accrued liabilities 117.9 87.2
Accrued payroll and related expenses 46.1 48.5
Deferred revenue 6.8 3.2
Total current liabilities 170.8 138.9
Other liabilities 19.6 18.2
Long term senior convertible notes 335.0 327.6
Total liabilities 525.4 484.7
Commitments and contingencies (Note 6)
Stockholders' equity:    
Preferred stock, $0.001 par value, 5.0 shares authorized; no shares issued and outstanding at June 30, 2018 and December 31, 2017, respectively 0.0 0.0
Common stock, $0.001 par value, 200.0 authorized; 88.7 and 88.4 issued and outstanding, respectively, at June 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 1,149.1 1,093.7
Accumulated other comprehensive loss (1.3) (2.6)
Accumulated deficit (665.8) (671.8)
Total stockholders’ equity 482.1 419.4
Total liabilities and stockholders’ equity $ 1,007.5 $ 904.1