Net Income Per Share Attributable to DASAN Zhone Solutions, Inc. - Reconciliation of Basic and Diluted Net Income (Loss) per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net income (loss) attributable to DASAN Zhone Solutions, Inc.	$ (4,033)	$ 1,798	$ (3,263)	$ 3,321
Basic (in shares)	21,384	16,683	18,732	16,425
Effect of dilutive securities:
Stock options, restricted stock units and share awards		208		215
Diluted (in shares)	21,384	16,891	18,732	16,640
Basic (in dollar per share)	$ (0.19)	$ 0.11	$ (0.17)	$ 0.20
Diluted (in dollar per share)	$ (0.19)	$ 0.11	$ (0.17)	$ 0.20