Overview and Basis of Presentation - Initial Public Offering - Sale of Stock (Details) - Initial Public Offering $ / shares in Units, $ in Millions	May 08, 2018 USD ($) $ / shares shares
Initial Public Offering
Issuance of common stock upon initial public offering, net of underwriting discounts and commissions and offering costs incurred (in shares) | shares	9,200,000
Share price (in dollars per share) | $ / shares	$ 19
Aggregate proceeds from IPO	$ 162.6
Offering costs	$ 4.9