Related Party Transactions - Sales and Purchases To and From Related Parties (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Related Party Transaction [Line Items]
Interest expense				$ 100	$ 800
Sales And Purchases To And From Related Parties
Related Party Transaction [Line Items]
Sales		$ 54	$ 552	1,965	2,077
Cost of revenue		55	485	1,821	1,907
Research and product development		296	306	910	771
Selling, marketing, general and administrative		413	523	1,242	1,238
Interest expense			324	132	763
Other expenses		42	93	180	263
DASAN | Majority Shareholder | Sales And Purchases To And From Related Parties
Related Party Transaction [Line Items]
Sales		54	552	1,965	2,077
Cost of revenue		45	485	1,791	1,887
Research and product development		253	306	776	690
Selling, marketing, general and administrative		394	523	1,185	1,183
Interest expense			324	132	763
Other expenses		42	$ 93	180	263
DASAN | Affiliated Entity | Sales And Purchases To And From Related Parties
Related Party Transaction [Line Items]
Cost of revenue	[1]	10		30	20
Research and product development	[1]	43		134	81
Selling, marketing, general and administrative	[1]	$ 19		$ 57	$ 55

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