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Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Assets    
Cash and cash equivalents $ 326,028 $ 189,680
Investment securities, available-for-sale 305,930 507,749
Accounts receivable, net 48,247 35,781
Interest and other receivables 2,035 2,093
Inventory 9,682 6,341
Prepaid expenses 25,694 18,606
Total current assets 717,616 760,250
Property and equipment, net 9,161 3,180
Operating lease right-of-use assets 47,283 9,524
Intangible assets, net 1,108 2,585
Restricted cash 5,770 4,787
Other assets 1,678 2,857
Total assets 782,616 783,183
Liabilities and stockholders’ equity    
Accounts payable 8,493 7,222
Accrued liabilities 97,474 67,604
Total current liabilities 105,967 74,826
Operating lease liabilities 44,460 6,361
Other long-term liabilities 5,180 2,861
Total liabilities 155,607 84,048
Commitments and contingencies (Note 9)
Stockholders’ equity:    
Preferred stock, $0.0001 par value; 5,000,000 shares authorized at December 31, 2020 and 2019; no shares issued and outstanding at December 31, 2020 and 2019
Common stock, $0.0001 par value; 225,000,000 shares authorized at December 31, 2020 and 2019; 159,637,771 shares and 155,275,300 shares issued and outstanding at December 31, 2020 and 2019, respectively 16 15
Additional paid-in capital 2,612,663 2,402,945
Accumulated deficit (1,985,706) (1,704,122)
Accumulated other comprehensive income 36 297
Total stockholders’ equity 627,009 699,135
Total liabilities and stockholders’ equity $ 782,616 $ 783,183