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Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Assets    
Cash and cash equivalents $ 134,758 $ 69,418
Investment securities, available-for-sale 338,762 271,924
Accounts receivable, net 26,090 17,343
Interest and other receivables 1,699 1,087
Inventory 4,070 5,248
Prepaid expenses 20,727 8,457
Total current assets 526,106 373,477
Property and equipment, net 3,309 2,662
Intangible assets, net 4,062 5,538
Restricted cash 4,826 2,475
Other assets 1,899 354
Total assets 540,202 384,506
Liabilities and stockholders’ equity    
Accounts payable 3,167 8,786
Accrued liabilities 56,398 40,244
Total current liabilities 59,565 49,030
Long-term liabilities 1,558 191
Total liabilities 61,123 49,221
Commitments and contingencies (Note 9)
Stockholders’ equity:    
Preferred stock, $0.0001 par value; 5,000,000 shares authorized at December 31, 2018 and 2017; no shares issued and outstanding at December 31, 2018 and 2017
Common stock, $0.0001 par value; 225,000,000 shares authorized at December 31, 2018 and December 31, 2017; 143,853,597 shares and 124,410,552 shares issued and outstanding at December 31, 2018 and December 31, 2017, respectively 14 12
Additional paid-in capital 1,948,300 1,559,343
Accumulated deficit (1,468,863) (1,223,671)
Accumulated other comprehensive loss (372) (399)
Total stockholders’ equity 479,079 335,285
Total liabilities and stockholders’ equity $ 540,202 $ 384,506