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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Assets    
Cash and cash equivalents $ 74,182 $ 69,418
Investment securities, available-for-sale 182,673 271,924
Accounts receivable, net 25,696 17,343
Interest and other receivables 986 1,087
Inventory 4,737 5,248
Prepaid expenses 12,822 8,457
Total current assets 301,096 373,477
Property and equipment, net 2,760 2,662
Intangible assets, net 4,800 5,538
Restricted cash 3,111 2,475
Other assets 3,193 354
Total assets 314,960 384,506
Liabilities and stockholders’ equity    
Accounts payable 3,333 8,786
Accrued liabilities 45,881 40,244
Total current liabilities 49,214 49,030
Long-term liabilities 1,026 191
Total liabilities 50,240 49,221
Commitments and contingencies (Note 9)
Stockholders’ equity:    
Preferred stock, $0.0001 par value; 5,000,000 shares authorized at June 30, 2018 and December 31, 2017; no shares issued and outstanding at June 30, 2018 and December 31, 2017
Common stock, $0.0001 par value; 225,000,000 shares authorized at June 30, 2018 and December 31, 2017; 124,999,365 shares and 124,410,552 shares issued and outstanding at June 30, 2018 and December 31, 2017, respectively 12 12
Additional paid-in capital 1,606,441 1,559,343
Accumulated deficit (1,341,233) (1,223,671)
Accumulated other comprehensive loss (500) (399)
Total stockholders’ equity 264,720 335,285
Total liabilities and stockholders’ equity $ 314,960 $ 384,506