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Investments (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Cost method investment	$ 3,440,000	$ 3,440,000
Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Impairment of equity method investments	$ 0
Digital Construction Works, Inc. | Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%
Equity method investments	$ 1,805,000	$ 2,251,000
Digital Construction Works, Inc. | Topcon
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%

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