Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Aug. 06, 2018
Document And Entity Information [Abstract]
Entity Registrant Name	Teligent, Inc.
Entity Central Index Key	0000352998
Document Period End Date	Jun. 30, 2018
Entity Filer Category	Accelerated Filer
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2018
Document Type	10-Q/A
Amendment Flag	true
Amendment Description	Restatement of June 30, 2018 10-Q to correct the accounting for the early and partial extinguishment of the 3.75% Company’s Convertible Senior Notes due 2019 (the “2019 Notes”) that resulted from the separate exchange agreements entered into with certain holders of the 2019 Notes in April 2018 as well as certain out of period accounting errors, which management believes are immaterial on an individual and aggregate basis to the Company’s unaudited interim condensed consolidated financial statements for the three and six-month periods ended June 30, 2018.
Trading Symbol	TLGT
Entity Common Stock, Shares Outstanding		53,537,888