Aggregate dividends declared during the period for each share of common stock outstanding.

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Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions		9 Months Ended
	Oct. 10, 2019	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation [Abstract]
Options vesting and exercisable period, maximum		8 years
Options termination period		9 years
Total stock-based compensation expense		$ 4.3	$ 3.8
Total unrecognized stock-based compensation expense		$ 14.4
Weighted average period over which total unrecognized stock-based compensation expense will be recognized		3 years 11 months 12 days
Subsequent Event
Subsequent Event [Line Items]
Dividend declared (in dollars per share)	$ 0.22