Significant Accounting Policies - Intangible Assets Finite Lives Amortized Over Period (Detail)	12 Months Ended
	Dec. 31, 2019
Intellectual Property Rights to the CRH O'Regan System [Member]
Finite-Lived Intangible Assets [Line Items]
Basis	Straight-line
Rate	15 years
Intellectual Property New Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Basis	Straight-line
Rate	20 years
Exclusive Professional Services Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Basis	Straight-line
Exclusive Professional Services Agreements [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Rate	4 years 6 months
Exclusive Professional Services Agreements [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Rate	15 years