Related Party Transactions - Balances of Receivables and Payables with Related Parties (Details) - USD ($)		Sep. 30, 2021	Dec. 31, 2020
Related Party Transaction [Line Items]
Other assets		$ 8,826,000	$ 5,919,000
Debt obligations		0	43,541,000
Receivables And Payables With Related Parties
Related Party Transaction [Line Items]
Account receivables		106,000	2,278,000
Other receivables		215,000	247,000
Other assets		693,000	755,000
Debt obligations			29,754,000
Accounts payable		590,000	1,584,000
DASAN | Majority Shareholder | Receivables And Payables With Related Parties
Related Party Transaction [Line Items]
Account receivables		106,000	2,278,000
Other receivables		215,000	247,000
Other assets		693,000	755,000
Debt obligations			29,754,000
Accounts payable		564,000	1,552,000
DASAN | Affiliated Entity | Receivables And Payables With Related Parties
Related Party Transaction [Line Items]
Accounts payable	[1]	$ 26,000	$ 32,000

[1] Dasan Invest indirectly holds 3.4% of DNI’s shares.