Intangible Assets (Narrative) (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	May 18, 2020
Finite-Lived Intangible Assets [Line Items]
Intangible assets impairment	$ 2,508,000	$ 0	$ 2,508,000
Intangible assets				$ 6,400,000
Customer List [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets amortization period		8 years
Self-Fitting Software [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets amortization period		5 years
Technology Access [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets amortization period		7 years
Emerald Medical Services Pte., Ltd [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets amortization period		8 years
Intangible assets				$ 6,400,000