Ekso Bionics Holdings, Inc. Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Capitalization and Equity Structure - Additional Information (Details)

Capitalization and Equity Structure - Additional Information (Details) - USD ($)	1 Months Ended				2 Months Ended	3 Months Ended				9 Months Ended
	Oct. 29, 2020	Jun. 30, 2020	Dec. 31, 2019	May 30, 2019	Feb. 28, 2021	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	May 31, 2019
Class of Stock [Line Items]
Common stock, shares authorized (in shares)						141,429,000				141,429,000		141,429,000
Preferred Stock, shares authorized (in shares)						10,000,000				10,000,000		10,000,000
Common stock, shares issued (in shares)						12,664,000				12,664,000		8,349,000
Common stock, shares outstanding (in shares)						12,664,000				12,664,000		8,349,000
Preferred stock, shares issued (in shares)						0				0		0
Preferred stock, shares outstanding (in shares)						0				0		0
Proceeds from direct offering										$ 37,295,000	$ 7,082,000
Warrants issued (in shares)										273,000
Value of shares sold										$ 1,417,000	3,334,000
Exercise of warrants							$ 3,878,000	$ 5,875,000	$ 1,436,000	$ 1,417,000	$ 1,436,000
Warrants exercised (in shares)										(358,000)
Number warrants called (in shares)						1,240,000				1,240,000		1,325,000
February 2021 Offering
Class of Stock [Line Items]
Percentage of warrants issued to purchase shares of common stock					7.00%
Exercise price (in dollars per share)					$ 12.81
2021 Warrants
Class of Stock [Line Items]
Warrants issued (in shares)					273,000					273,000
Exercise price (in dollars per share)					$ 12.81	$ 12.81				$ 12.81
Warrants exercised (in shares)										0
Duration of put option					30 days
Put option pay period					5 days
Number warrants called (in shares)						273,000				273,000		0
Class of warrant or right expiration period					5 years					5 years
June 2020 Investor Warrants
Class of Stock [Line Items]
Warrants issued (in shares)										0
Exercise price (in dollars per share)		$ 5.18				$ 5.18			$ 5.18	$ 5.18
Warrants exercised (in shares)										(270,000)	0
Duration of put option		30 days
Number warrants called (in shares)		874,000				127,000			874,000	127,000		397,000
Class of warrant or right expiration period										5 years 6 months
June 2020 Placement Agent Warrants
Class of Stock [Line Items]
Warrants issued (in shares)		122,000								0
Exercise price (in dollars per share)						$ 5.64				$ 5.64
Warrants exercised (in shares)										(83,000)	0
Number warrants called (in shares)						39,000				39,000		122,000
Class of warrant or right expiration period										5 years
December 2019 Warrants
Class of Stock [Line Items]
Warrants issued (in shares)										0
Exercise price (in dollars per share)			$ 8.10			$ 8.10				$ 8.10
Warrants exercised (in shares)										0
Duration of put option			30 days
Put option pay period			5 days
Number warrants called (in shares)			556,000			556,000				556,000		556,000
Class of warrant or right expiration period			5 years							5 years
December 2019 Placement Agent Warrants
Class of Stock [Line Items]
Warrants issued (in shares)										0
Exercise price (in dollars per share)			$ 8.44			$ 8.44				$ 8.44
Warrants exercised (in shares)										0
Number warrants called (in shares)			52,000			52,000				52,000		52,000
Class of warrant or right expiration period										5 years
May 2019 Warrants
Class of Stock [Line Items]
Warrants issued (in shares)										0
Exercise price (in dollars per share)		$ 3.52				$ 3.52			$ 3.52	$ 3.52			$ 3.52
Warrants exercised (in shares)										(5,000)	0
Duration of put option				90 days
Number warrants called (in shares)						193,000				193,000		198,000	444,000
Class of warrant or right expiration period										5 years
June 2020 Warrants
Class of Stock [Line Items]
Exercise price (in dollars per share)		5.18							$ 5.18
Class of warrant or right expiration period										5 years 6 months
Underwriting agreement \| February 2021 Offering
Class of Stock [Line Items]
Number warrants called (in shares)					3,902,000
Sale of shares (in dollars per share)					$ 10.25
Value of shares sold					$ 40,000,000
Proceeds from direct offering					$ 36,504,000
Expected term					5 years
At-The-Market Offering
Class of Stock [Line Items]
Number warrants called (in shares)						0				78,000
Sale of shares (in dollars per share)	$ 6.75					$ 10.72				$ 10.72
Value of shares sold	$ 7,500,000
Commission and issuance costs										$ 791,000
Common Stock
Class of Stock [Line Items]
Exercise of warrants							$ 1,000
Exercise of warrants (in shares)								500,000	223,000	300,000	723,000
Common Stock \| At-The-Market Offering
Class of Stock [Line Items]
Available for future offerings										$ 6,668,000
Common Stock \| Direct Offering \| May 2019 Warrants
Class of Stock [Line Items]
Sale of shares (in dollars per share)		$ 4.51							$ 4.51