Investment - Summary of Available-for-Sale Investments by Security type (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Net Investment Income [Line Items]
Amortized cost		$ 64,929,745
Gross Unrealized Gains		9,505
Gross Unrealized Losses		0
Estimated Fair Value	$ 69,997,200	64,939,250
U.S. Treasuries - ST [Member]
Net Investment Income [Line Items]
Amortized cost		4,999,587
Gross Unrealized Gains		7,463
Gross Unrealized Losses		0
Estimated Fair Value		5,007,050
US Treasury Bond Securities Cash Equivalents [Member]
Net Investment Income [Line Items]
Amortized cost	69,913,449	59,930,158
Gross Unrealized Gains	83,751	2,042
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 69,997,200	$ 59,932,200