Stockholders' Equity (Schedule of Warrants Description) (Details) - $ / shares		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2016
ZNWAA Warrants [Member]
Class of Warrant or Right [Line Items]
Warrant name	[1]	ZNWAA Warrants
Warrant exercise price		$ 2.00	[1]	$ 2.00
Warrant expiration date	[1]	Jan. 31, 2020
ZNWAA Warrants [Member] | Beginning Date [Member]
Class of Warrant or Right [Line Items]
Warrant period of grant	[1]	Mar. 01, 2013
ZNWAA Warrants [Member] | Ending Date [Member]
Class of Warrant or Right [Line Items]
Warrant period of grant	[1]	Dec. 31, 2014
ZNWAB Warrants [Member]
Class of Warrant or Right [Line Items]
Warrant exercise price				1.00
ZNWAC Warrants [Member]
Class of Warrant or Right [Line Items]
Warrant exercise price				1.00
ZNWAD Warrants [Member]
Class of Warrant or Right [Line Items]
Warrant name	[1],[2]	ZNWAD Warrants
Warrant exercise price		$ 1.00	[1],[2]	1.00
Warrant expiration date	[1],[2]	May 02, 2020
ZNWAD Warrants [Member] | Beginning Date [Member]
Class of Warrant or Right [Line Items]
Warrant period of grant	[1],[2]	Jan. 01, 2015
ZNWAD Warrants [Member] | Ending Date [Member]
Class of Warrant or Right [Line Items]
Warrant period of grant	[1],[2]	Mar. 31, 2016
ZNWAE Warrants [Member]
Class of Warrant or Right [Line Items]
Warrant name	[1]	ZNWAE Warrants
Warrant exercise price		$ 1.00	[1]	1.00
Warrant expiration date	[1]	May 01, 2020
ZNWAE Warrants [Member] | Beginning Date [Member]
Class of Warrant or Right [Line Items]
Warrant period of grant	[1]	Nov. 01, 2016
ZNWAE Warrants [Member] | Ending Date [Member]
Class of Warrant or Right [Line Items]
Warrant period of grant	[1]	Mar. 31, 2017
ZNWAF Warrants [Member]
Class of Warrant or Right [Line Items]
Warrant name	[1],[2]	ZNWAF Warrants
Warrant exercise price		$ 1.00	[1],[2]	1.00
Warrant expiration date	[1],[2]	Aug. 14, 2020
ZNWAF Warrants [Member] | Beginning Date [Member]
Class of Warrant or Right [Line Items]
Warrant period of grant	[1],[2]	May 01, 2017
ZNWAF Warrants [Member] | Ending Date [Member]
Class of Warrant or Right [Line Items]
Warrant period of grant	[1],[2]	Jul. 31, 2017
ZNWAG Warrants [Member]
Class of Warrant or Right [Line Items]
Warrant name	[1]	ZNWAG Warrants
Warrant exercise price		$ 1.00	[1]	1.00
Warrant expiration date	[1]	Jan. 08, 2021
ZNWAG Warrants [Member] | Beginning Date [Member]
Class of Warrant or Right [Line Items]
Warrant period of grant	[1]	Oct. 01, 2017
ZNWAG Warrants [Member] | Ending Date [Member]
Class of Warrant or Right [Line Items]
Warrant period of grant	[1]	Dec. 31, 2017
ZNWAH Warrants [Member
Class of Warrant or Right [Line Items]
Warrant name	[1],[2]	ZNWAH Warrants
Warrant exercise price		$ 5.00	[1],[2]	5.00
Warrant expiration date	[1],[2]	Apr. 02, 2020
ZNWAH Warrants [Member | February 2018 [Member]
Class of Warrant or Right [Line Items]
Warrant period of grant	[1],[2]	Feb. 28, 2018
ZNWAI Warrants [Member]
Class of Warrant or Right [Line Items]
Warrant name	[1],[2]	ZNWAI Warrants
Warrant exercise price		$ 3.00	[1],[2]	3.00
Warrant expiration date	[1],[2]	Jun. 29, 2020
ZNWAI Warrants [Member] | Beginning Date [Member]
Class of Warrant or Right [Line Items]
Warrant period of grant	[1],[2]	Apr. 01, 2018
ZNWAI Warrants [Member] | Ending Date [Member]
Class of Warrant or Right [Line Items]
Warrant period of grant	[1],[2]	May 31, 2018
ZNWAJ Warrants [Member]
Class of Warrant or Right [Line Items]
Warrant name	[1]	ZNWAJ Warrants
Warrant exercise price		$ 1.00	[1]	$ 1.00
Warrant expiration date	[1]	Oct. 29, 2020
ZNWAJ Warrants [Member] | Beginning Date [Member]
Class of Warrant or Right [Line Items]
Warrant period of grant	[1],[2]	Aug. 01, 2018
ZNWAJ Warrants [Member] | Ending Date [Member]
Class of Warrant or Right [Line Items]
Warrant period of grant	[1]	Sep. 30, 2018
ZNWAK Warrants [Member]
Class of Warrant or Right [Line Items]
Warrant name	[1]	ZNWAK Warrants
Warrant exercise price	[1]	$ 0.01
Warrant expiration date	[1]	Feb. 25, 2020
ZNWAK Warrants [Member] | Beginning Date [Member]
Class of Warrant or Right [Line Items]
Warrant period of grant	[1]	Dec. 01, 2018
ZNWAK Warrants [Member] | Ending Date [Member]
Class of Warrant or Right [Line Items]
Warrant period of grant	[1]	Jan. 31, 2019

[1] Zion's ZNWAB Warrants expired on May 2, 2017 and its ZNWAC Warrants expired on May 2, 2018

[2] On December 4, 2018, the Company extended the termination date of the Warrants by one (1) year.