Equity (Details) - USD ($) $ / shares in Units, $ in Millions	Jun. 03, 2020	Apr. 29, 2020	Jun. 30, 2020	Dec. 31, 2019
Subsidiary, Sale of Stock [Line Items]
Common stock, par value (in dollars per share)			$ 0.001	$ 0.001
Common Stock Offering
Subsidiary, Sale of Stock [Line Items]
Shares sold in offering (in shares)		4,400,000
Common stock, par value (in dollars per share)		$ 0.001
Offering price per share (in dollars per share)		28.50
Underwriting discounts and commissions on sale price (in dollars per share)		$ 1.71
Option period (in days)		30 days
Net proceeds of common stock		$ 117.9
Payments of equity issue costs		$ 7.5
Over-Allotment Option
Subsidiary, Sale of Stock [Line Items]
Shares sold in offering (in shares)	351,500	660,000
Net proceeds of common stock	$ 9.4
Payments of equity issue costs	$ 0.6