Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2019	May 06, 2019
Document And Entity Information [Abstract]
Entity Registrant Name	Teligent, Inc.
Entity Central Index Key	0000352998
Document Period End Date	Mar. 31, 2019
Entity Filer Category	Accelerated Filer
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Type	10-Q
Amendment Flag	false
Entity Emerging Growth Company	false
Entity Small Business	true
Trading Symbol	TLGT
Entity Common Stock, Shares Outstanding		53,850,427