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Condensed Consolidated Balance Sheets - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Current assets:    
Cash and cash equivalents $ 415.1 $ 112.3
Debt securities available-for-sale, at fair value (amortized cost $530.3 million at June 30, 2020 and $557.3 million at December 31, 2019) 533.2 558.2
Accounts receivable 148.4 126.6
Inventories 22.0 17.3
Other current assets 27.5 16.6
Total current assets 1,146.2 831.0
Debt securities available-for-sale, at fair value (amortized cost $193.5 million at June 30, 2020 and $299.3 million at December 31, 2019) 195.2 299.7
Right-of-use assets 72.1 74.3
Equity securities 50.7 55.9
Property and equipment, net 44.6 41.9
Restricted cash 3.2 3.2
Other long-term assets 3.6 0.0
Total assets 1,515.6 1,306.0
Current liabilities:    
Accounts payable and accrued liabilities 137.1 141.3
Convertible senior notes 419.5 408.8
Other current liabilities 16.4 15.2
Total current liabilities 573.0 565.3
Operating lease liabilities 84.3 86.7
Other long-term liabilities 27.1 17.1
Total liabilities 684.4 669.1
Stockholders’ equity:    
Preferred stock, $0.001 par value; 5.0 shares authorized; no shares issued and outstanding at June 30, 2020 and December 31, 2019 0.0 0.0
Common stock, $0.001 par value; 220.0 shares authorized; issued and outstanding shares were 93.2 at June 30, 2020 and 92.3 at December 31, 2019 0.1 0.1
Additional paid-in capital 1,842.2 1,768.1
Accumulated other comprehensive income 4.6 1.4
Accumulated deficit (1,015.7) (1,132.7)
Total stockholders’ equity 831.2 636.9
Total liabilities and stockholders’ equity $ 1,515.6 $ 1,306.0