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Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Current assets:    
Cash and cash equivalents $ 254,712 $ 83,267
Short-term investments, available-for-sale 261,217 224,083
Accounts receivable 31,127 0
Other current assets 7,863 3,092
Total current assets 554,919 310,442
Property and equipment, net 10,811 6,271
Long-term investments, available-for-sale 247,361 43,490
Restricted cash 4,500 4,883
Total assets 817,591 365,086
Current liabilities:    
Accounts payable and accrued liabilities 53,520 26,182
Current portion of deferred rent 0 470
Current portion of cease-use liability 62 236
Current portion of deferred gain on sale of real estate 731 3,526
Other current liabilities 113 0
Total current liabilities 54,426 30,414
Deferred gain on sale of real estate 8,043 7,372
Deferred revenue 10,231 10,231
Deferred rent 3,135 1,462
Convertible senior notes 369,618 0
Cease-use liability 0 617
Other liabilities 0 113
Total liabilities 445,453 50,209
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 88,793,903 and 86,883,300 at December 31, 2017 and 2016, respectively 89 87
Additional paid-in capital 1,572,765 1,371,432
Accumulated other comprehensive loss (1,850) (318)
Accumulated deficit (1,198,866) (1,056,324)
Total stockholders' equity 372,138 314,877
Total liabilities and stockholders' equity $ 817,591 $ 365,086