Commitments and Contingencies - Payment Guarantees to Third Parties (Details) $ in Thousands	Sep. 30, 2016 USD ($)
Guarantor Obligations [Line Items]
Amount Guaranteed	$ 34,049
Dasan Network Solutions, Inc. (DNS) | Payment Guarantee
Guarantor Obligations [Line Items]
Amount Guaranteed	6,000
Dasan Network Solutions, Inc. (DNS) | Shinhan Bank, General Loan | Payment Guarantee
Guarantor Obligations [Line Items]
Amount Guaranteed	4,378
Dasan Network Solutions, Inc. (DNS) | KEB Hana Bank Credit Loan | Payment Guarantee
Guarantor Obligations [Line Items]
Amount Guaranteed	4,800
Dasan Network Solutions, Inc. (DNS) | Industrial Bank of Korea Facility | Payment Guarantee
Guarantor Obligations [Line Items]
Amount Guaranteed	11,684
Industrial Bank of Korea | Payment Guarantee
Guarantor Obligations [Line Items]
Amount Guaranteed	3,593
NongHyup Bank | Payment Guarantee
Guarantor Obligations [Line Items]
Amount Guaranteed	2,156
Other | Payment Guarantee
Guarantor Obligations [Line Items]
Amount Guaranteed	$ 1,438