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Consolidated Balance Sheets - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Assets    
Cash and cash equivalents $ 189,680,000 $ 134,758,000
Investment securities, available-for-sale 507,749,000 338,762,000
Accounts receivable, net 35,781,000 26,090,000
Interest and other receivables 2,093,000 1,699,000
Inventory 6,341,000 4,070,000
Prepaid expenses 18,606,000 20,727,000
Total current assets 760,250,000 526,106,000
Property and equipment, net 3,180,000 3,309,000
Operating lease right-of-use assets 9,524,000 0
Intangible assets, net 2,585,000 4,062,000
Restricted cash 4,787,000 4,826,000
Other assets 2,857,000 1,899,000
Total assets 783,183,000 540,202,000
Liabilities and stockholders’ equity    
Accounts payable 7,222,000 3,167,000
Accrued liabilities 67,604,000 56,398,000
Total current liabilities 74,826,000 59,565,000
Operating lease liabilities 6,361,000  
Other long-term liabilities 2,861,000 1,558,000
Total liabilities 84,048,000 61,123,000
Commitments and contingencies (Note 9)
Stockholders’ equity:    
Preferred stock, $0.0001 par value; 5,000,000 shares authorized at December 31, 2019 and 2018; no shares issued and outstanding at December 31, 2019 and 2018
Common stock, $0.0001 par value; 225,000,000 shares authorized at December 31, 2019 and 2018; 155,275,300 shares and 143,853,597 shares issued and outstanding at December 31, 2019 and 2018, respectively 15,000 14,000
Additional paid-in capital 2,402,945,000 1,948,300,000
Accumulated deficit (1,704,122,000) (1,468,863,000)
Accumulated other comprehensive income (loss) 297,000 (372,000)
Total stockholders’ equity 699,135,000 479,079,000
Total liabilities and stockholders’ equity $ 783,183,000 $ 540,202,000