Property, Plant & Equipment, Net - Additional Information (Detail)				1 Months Ended	12 Months Ended
	Dec. 14, 2018 USD ($)	Dec. 14, 2018 GBP (£)	Jul. 31, 2018 Lease	Dec. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2018 GBP (£)	Feb. 29, 2016 USD ($)
Property, Plant and Equipment [Line Items]
Asset retirement obligations, noncurrent				$ 140,129	$ 140,129
Asset retirement obligation				128,119	128,119	$ 178,419	$ 221,254
Number of operating leases | Lease			2
Capitalized lease obligation				7,097	7,097	34,298
Depreciation expense					2,053,220	679,177
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Asset retirement obligation				69,286	69,286
Capitalized Leasehold Interest [Member]
Property, Plant and Equipment [Line Items]
Capital lease obligations				7,150,611	7,150,611
Accumulated depreciation				6,928	6,928
Computer and Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Capitalized lease obligation				95,880	95,880	95,880
Accumulated depreciation				$ 62,912	$ 62,912	$ 34,552
Operating Sublease [Member]
Property, Plant and Equipment [Line Items]
Lessee operating Lease, term of contract	108 years	108 years		108 years	108 years			108 years	5 years
Payment of operating lease base rent	$ 6,615,000	£ 5,250,000
Lessee operating Lease, additional term of lease									5 years
Capital lease obligations				$ 7,150,611	$ 7,150,611			£ 5,613,165
Capital lease assets amortization period	25 years	25 years		25 years
Exchange rate	1.2600	1.2600		1.2739	1.2739			1.2739
Asset retirement obligations, noncurrent									$ 306,400
Asset retirement obligations, discounted rate							8.00%
Asset retirement obligation remeasurement period						8 years
Operating Sublease [Member] | Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Asset retirement obligation							$ 205,659
Asset retirement obligation recorded in leasehold improvements	$ (99,090)					$ (75,011)