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Condensed Consolidated Balance Sheets - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Assets    
Cash and cash equivalents $ 74,432,000 $ 134,758,000
Investment securities, available-for-sale 307,455,000 338,762,000
Accounts receivable, net 31,781,000 26,090,000
Interest and other receivables 941,000 1,699,000
Inventory 3,824,000 4,070,000
Prepaid expenses 18,507,000 20,727,000
Total current assets 436,940,000 526,106,000
Property and equipment, net 3,427,000 3,309,000
Operating lease right-of-use assets 10,818,000 0
Intangible assets, net 3,323,000 4,062,000
Restricted cash 4,787,000 4,826,000
Other assets 1,588,000 1,899,000
Total assets 460,883,000 540,202,000
Liabilities and stockholders’ equity    
Accounts payable 4,650,000 3,167,000
Accrued liabilities 59,164,000 56,398,000
Total current liabilities 63,814,000 59,565,000
Operating lease liabilities 6,742,000  
Other long-term liabilities 1,413,000 1,558,000
Total liabilities 71,969,000 61,123,000
Commitments and contingencies (Note 9)
Stockholders’ equity:    
Preferred stock, $0.0001 par value; 5,000,000 shares authorized at June 30, 2019 and December 31, 2018; no shares issued and outstanding at June 30, 2019 and December 31, 2018
Common stock, $0.0001 par value; 225,000,000 shares authorized at June 30, 2019 and December 31, 2018; 144,454,130 shares and 143,853,597 shares issued and outstanding at June 30, 2019 and December 31, 2018, respectively 14,000 14,000
Additional paid-in capital 1,997,454,000 1,948,300,000
Accumulated deficit (1,609,108,000) (1,468,863,000)
Accumulated other comprehensive gain (loss) 554,000 (372,000)
Total stockholders’ equity 388,914,000 479,079,000
Total liabilities and stockholders’ equity $ 460,883,000 $ 540,202,000