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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Assets    
Cash and cash equivalents $ 63,897 $ 69,418
Investment securities, available-for-sale 150,239 271,924
Accounts receivable, net 19,958 17,343
Interest and other receivables 724 1,087
Inventory 4,347 5,248
Prepaid expenses 14,951 8,457
Total current assets 254,116 373,477
Property and equipment, net 3,372 2,662
Intangible assets, net 4,431 5,538
Restricted cash 3,111 2,475
Other assets 1,426 354
Total assets 266,456 384,506
Liabilities and stockholders’ equity    
Accounts payable 2,955 8,786
Accrued liabilities 38,852 40,244
Total current liabilities 41,807 49,030
Long-term liabilities 1,209 191
Total liabilities 43,016 49,221
Commitments and contingencies (Note 9)
Stockholders’ equity:    
Preferred stock, $0.0001 par value; 5,000,000 shares authorized at September 30, 2018 and December 31, 2017; no shares issued and outstanding at September 30, 2018 and December 31, 2017
Common stock, $0.0001 par value; 225,000,000 shares authorized at September 30, 2018 and December 31, 2017; 125,023,015 shares and 124,410,552 shares issued and outstanding at September 30, 2018 and December 31, 2017, respectively 12 12
Additional paid-in capital 1,627,113 1,559,343
Accumulated deficit (1,403,371) (1,223,671)
Accumulated other comprehensive loss (314) (399)
Total stockholders’ equity 223,440 335,285
Total liabilities and stockholders’ equity $ 266,456 $ 384,506