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Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 141,714 $ 254,712
Short-term investments, available-for-sale 509,199 261,217
Accounts receivable 56,240 31,127
Inventory 10,864 1,024
Other current assets 19,760 6,839
Total current assets 737,777 554,919
Property and equipment, net 33,869 10,811
Long-term investments, available-for-sale 216,028 247,361
Restricted cash 5,477 4,500
Total assets 993,151 817,591
Current liabilities:    
Accounts payable and accrued liabilities 86,377 53,520
Other current liabilities 1,856 906
Total current liabilities 88,233 54,426
Deferred gain on sale of real estate 7,312 8,043
Deferred revenue 10,231 10,231
Deferred rent 18,114 3,135
Convertible senior notes 388,496 369,618
Total liabilities 512,386 445,453
Commitments and contingencies
Stockholders’ equity:    
Preferred stock, $0.001 par value; 5,000,000 shares authorized; no shares issued and outstanding 0 0
Common stock, $0.001 par value; 220,000,000 shares authorized; issued and outstanding shares were 90,797,087 and 88,793,903 at December 31, 2018 and 2017, respectively 91 89
Additional paid-in capital 1,660,361 1,572,765
Accumulated other comprehensive loss (1,932) (1,850)
Accumulated deficit (1,177,755) (1,198,866)
Total stockholders’ equity 480,765 372,138
Total liabilities and stockholders’ equity $ 993,151 $ 817,591