Subsequent Event - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	Aug. 03, 2020	Jul. 02, 2020	Jun. 30, 2020	Jan. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Jan. 31, 2019
Subsequent Event [Line Items]
Common stock, par value (USD per share)			$ 0.001		$ 0.001
Sale price of common stock (USD per share)				$ 97.50		$ 97.00	$ 62.00
Subsequent Event | Common Stock
Subsequent Event [Line Items]
Common stock, par value (USD per share)		$ 0.001
Aggregate offering price		$ 200.0
License Agreement with ORIC Pharmaceuticals, Inc. | Subsequent Event
Subsequent Event [Line Items]
One-time non-cash payment for license agreement	$ 20.0
Sale price of common stock (USD per share)	$ 34.00
Premium rate (as a percent)	10.00%