Balance Sheets (Parentheticals) - $ / shares	Dec. 31, 2019	Dec. 31, 2018	Apr. 30, 2018
Common stock subject to possible redemption, outstanding (in shares)	37,725,710	41,400,000
Common stock subject to possible redemption, redemption value per share (in dollars per share)	$ 10.10	$ 10
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common Class A [Member]
Common stock subject to possible redemption, outstanding (in shares)	37,806,000	41,400,000
Common stock subject to possible redemption, redemption value per share (in dollars per share)	$ 10.10	$ 10
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	80,290	0
Common stock, shares outstanding (in shares)	80,290	0
Common Class B [Member]
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	15,000,000	15,000,000
Common stock, shares issued (in shares)	10,350,000	10,350,000
Common stock, shares outstanding (in shares)	10,350,000	10,350,000	10,350,000