Goodwill and Intangible Assets - Schedule of Changes in Carrying Amounts of IPR&D Assets and Goodwill (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Indefinite Lived Intangible Assets By Major Class [Line Items]
Goodwill Balance, beginning of period		$ 0
Goodwill, Additions from the mergers			$ 490,676
Goodwill, Impairment charges			(490,676)
Goodwill Balance, end of period	$ 0	0	0
IPR&D [Member]
Indefinite Lived Intangible Assets By Major Class [Line Items]
IPR&D Balance, beginning of period		13,418,967	38,245,871
IPR&D, Foreign currency translation adjustments			(376,893)
IPR&D, Impairment charges	(24,450,011)	(1,000,000)	(24,450,011)
IPR&D Balance, end of period	$ 13,418,967	$ 12,418,967	$ 13,418,967