Subsequent Events (Details) - Subsequent Events [Member]	1 Months Ended
	Nov. 09, 2018 USD ($) shares
George J. Coates [Member] \| Deferred compensation [Member]
Subsequent Event [Line Items]
Additional deferred compensation	$ 29,000
George J. Coates [Member] \| Series B Convertible Preferred Stock [Member]
Subsequent Event [Line Items]
Issuance of common stock anti-dilution shares \| shares	755,946
Issuance of anti-dilution estimated fair value	$ 129,000
Gregory G. Coates [Member] \| Deferred compensation [Member]
Subsequent Event [Line Items]
Additional deferred compensation	$ 9,000
Gregory G. Coates [Member] \| Series B Convertible Preferred Stock [Member]
Subsequent Event [Line Items]
Issuance of common stock anti-dilution shares \| shares	57,221
Issuance of anti-dilution estimated fair value	$ 10,000
Barry C. Kaye [Member] \| Deferred compensation [Member]
Subsequent Event [Line Items]
Additional deferred compensation	12,000
Payments of deferred compensation	$ 7,000
Barry C. Kaye [Member] \| Series B Convertible Preferred Stock [Member]
Subsequent Event [Line Items]
Issuance of common stock anti-dilution shares \| shares	4,484
Issuance of anti-dilution estimated fair value	$ 1,000
One employee [Member] \| Deferred compensation [Member]
Subsequent Event [Line Items]
Additional deferred compensation	4,000
Convertible Promissory Note [Member]
Subsequent Event [Line Items]
Total amount of convertible notes converted to common stock	$ 57,000
Unregistered, restricted shares of common stock issued upon conversion \| shares	337,299,945
Aggregate cash proceeds	$ 50,000
Common stock conversion price, percentage	70.00%
Promissory Note to Related Party [Member] \| George J. Coates [Member]
Subsequent Event [Line Items]
Aggregate cash proceeds	$ 5,000
Promissory Note to Related Party [Member] \| Gregory G. Coates [Member]
Subsequent Event [Line Items]
Repayment of promissory note	7,000
Promissory Note to Related Party [Member] \| Bernadette Coates [Member]
Subsequent Event [Line Items]
Aggregate cash proceeds	$ 2,000

COATES INTERNATIONAL LTD \DE\ 10-Q