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Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair value measurements
Restricted cash	$ 603	$ 603
Headquarters and laboratory facilities, South San Francisco, lease signed April 2015
Fair value measurements
Restricted cash	603	603
Recurring | Level I | Headquarters and laboratory facilities, South San Francisco, lease signed April 2015
Fair value measurements
Restricted cash	603	603
Recurring | Level I | Money market funds
Fair value measurements
Financial assets	$ 77,400	$ 33,100

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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