Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 267,818	$ 83,267
Short-term investments, available-for-sale	243,200	224,083
Accounts receivable	29,818	0
Inventory	242	0
Other current assets	7,407	3,092
Total current assets	548,485	310,442
Property and equipment, net	9,140	6,271
Long-term investments, available-for-sale	210,258	43,490
Restricted cash	4,613	4,883
Total assets	772,496	365,086
Current liabilities:
Accounts payable and accrued liabilities	37,289	26,182
Current portion of cease-use liability	121	236
Current portion of deferred rent	0	470
Current portion of deferred gain on sale of real estate	731	3,526
Total current liabilities	38,141	30,414
Deferred gain on sale of real estate	8,226	7,372
Deferred revenue	10,231	10,231
Deferred rent	3,163	1,462
Convertible senior notes	365,110	0
Cease-use liability	0	617
Other liabilities	113	113
Total liabilities	424,984	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 88,462,002 as of September 30, 2017 and 86,883,300 as of December 31, 2016	88	87
Additional paid-in capital	1,553,718	1,371,432
Accumulated other comprehensive loss	(534)	(318)
Accumulated deficit	(1,205,760)	(1,056,324)
Total stockholders' equity	347,512	314,877
Total liabilities and stockholders' equity	$ 772,496	$ 365,086