Fair Value of Financial Assets and Liabilities (Tables)

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Schedule of fair value assets and liabilities

	Fair value measured at March 31, 2021
	Total at March 31,		Quoted prices in active markets		Significant other observable inputs		Significant unobservable inputs
	2021		(Level 1)		(Level 2)		(Level 3)
Assets
Marketable securities	$	92,426	$	92,426	$	-	$	-
Short-term investment	$	2,298	$	2,298	$	-	$	-
Convertible note receivable	$	2,027	$	-	$	-	$	2,027

	Fair value measured at December 31, 2020
	Total at December 31,		Quoted prices in active markets		Significant other observable inputs		Significant unobservable inputs
	2020		(Level 1)		(Level 2)		(Level 3)
Assets
Marketable securities	$	24,801	$	24,801	$	-	$	-
Investments	$	2,764	$	2,764	$	-	$	-

Schedule of financial assets measured at fair value on a recurring basis

	Fair Value of Level 3 investment
	March 31, 2021		December 31, 2020
Beginning balance	$	-	$	-
Purchase of convertible note		2,000		-
Accrued interest receivable		27		-
Ending balance	$	2,027	$	-