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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Current assets:    
Cash and cash equivalents $ 140,985 $ 141,714
Short-term investments in available-for-sale debt securities 478,993 509,199
Accounts receivable 95,357 56,240
Inventory 12,018 10,864
Other current assets 21,455 19,760
Total current assets 748,808 737,777
Restricted cash 5,477 5,477
Property and equipment, net 39,623 33,869
Long-term investments in available-for-sale debt securities 146,503 216,028
Investment in restricted equity securities 77,365  
Operating lease assets 49,085  
Total assets 1,066,861 993,151
Current liabilities:    
Accounts payable and accrued liabilities 95,027 86,377
Other current liabilities 5,562 1,856
Total current liabilities 100,589 88,233
Noncurrent operating lease liabilities 66,185  
Convertible senior notes 398,466 388,496
Other long-term liabilities 17,915 10,231
Deferred rent   18,114
Deferred gain on sale of real estate   7,312
Total liabilities 583,155 512,386
Stockholders’ equity:    
Preferred stock, $0.001 par value; 5,000 shares authorized; no shares issued and outstanding
Common stock, $0.001 par value; 220,000 shares authorized; issued and outstanding shares were 91,536 as of June 30, 2019 and 90,797 as of December 31, 2018 92 91
Additional paid-in capital 1,703,458 1,660,361
Accumulated other comprehensive income (loss) 645 (1,932)
Accumulated deficit (1,220,489) (1,177,755)
Total stockholders’ equity 483,706 480,765
Total liabilities and stockholders’ equity $ 1,066,861 $ 993,151