Fair Value Measurements (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Fair value measurements, recurring and nonrecurring, valuation techniques
Cash and marketable securities held in Trust Account	$ 254,324,010	$ 253,019,179
Trust account held in cash	300	900
Fair value measurements, (Recurring) | Level 1
Fair value measurements, recurring and nonrecurring, valuation techniques
Cash and marketable securities held in Trust Account	$ 254,324,010	$ 253,019,179