Credit Facilities (3.25% Convertible Senior Notes due 2020) (Details) - USD ($)	Jun. 30, 2020	Jun. 30, 2019	Apr. 03, 2019	Mar. 31, 2019	Aug. 09, 2018	Nov. 02, 2015
Revolving loan facility
Debt Instrument [Line Items]
Debt instrument, stated interest rate		5.50%
Convertible Senior Notes Due 2020
Debt Instrument [Line Items]
Debt instrument, stated interest rate					3.25%
Debt instrument face amount					$ 40,500,000
Convertible Senior Notes Due 2020 \| Convertible notes
Debt Instrument [Line Items]
Debt instrument, stated interest rate						3.25%
Debt instrument face amount						$ 125,000,000.0
Convertible notes payable	$ 100,000
Amended and Restated Facility Agreement \| Revolving loan facility
Debt Instrument [Line Items]
Debt instrument face amount					$ 40,500,000
Convertible Senior Notes Issued November, 2015 \| Convertible notes \| Two Investors
Debt Instrument [Line Items]
Debt instrument face amount				$ 73,400,000
5% Note \| Convertible notes
Debt Instrument [Line Items]
Debt instrument, stated interest rate		5.00%	5.00%	5.00%
Debt instrument face amount			$ 25,000,000.0
Convertible notes payable	$ 30,400,000
5% Note \| Convertible notes \| Two Investors
Debt Instrument [Line Items]
Debt instrument face amount			$ 42,000,000.0

ENDOLOGIX INC /DE/ 10-Q