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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Assets    
Cash and cash equivalents $ 97,557 $ 134,758
Investment securities, available-for-sale 316,767 338,762
Accounts receivable, net 29,958 26,090
Interest and other receivables 3,812 1,699
Inventory 4,570 4,070
Prepaid expenses 23,742 20,727
Total current assets 476,406 526,106
Property and equipment, net 3,737 3,309
Operating lease right-of-use assets 10,918  
Intangible assets, net 3,692 4,062
Restricted cash 4,787 4,826
Other assets 1,565 1,899
Total assets 501,105 540,202
Liabilities and stockholders’ equity    
Accounts payable 3,275 3,167
Accrued liabilities 71,708 56,398
Total current liabilities 74,983 59,565
Operating lease liabilities 6,754  
Other long-term liabilities 1,012 1,558
Total liabilities 82,749 61,123
Commitments and contingencies (Note 9)
Stockholders’ equity:    
Preferred stock, $0.0001 par value; 5,000,000 shares authorized at March 31, 2019 and December 31, 2018; no shares issued and outstanding at March 31, 2019 and December 31, 2018
Common stock, $0.0001 par value; 225,000,000 shares authorized at March 31, 2019 and December 31, 2018; 144,127,644 shares and 143,853,597 shares issued and outstanding at March 31, 2019 and December 31, 2018, respectively 14 14
Additional paid-in capital 1,972,302 1,948,300
Accumulated deficit (1,554,167) (1,468,863)
Accumulated other comprehensive gain (loss) 207 (372)
Total stockholders’ equity 418,356 479,079
Total liabilities and stockholders’ equity $ 501,105 $ 540,202