Annual report pursuant to Section 13 and 15(d)

Subsequent events (Details)

v3.10.0.1
Subsequent events (Details) - USD ($)
$ / shares in Units, shares in Thousands
1 Months Ended 2 Months Ended
Jan. 31, 2019
Feb. 28, 2019
Dec. 31, 2018
Common Stock | Subsequent event      
Subsequent Event [Line Items]      
Number of shares sold (in shares)   1,294  
Value of shares sold   $ 2,328,000  
Sale of shares (in dollars per share)   $ 1.85  
Joint Venture | Subsequent event      
Subsequent Event [Line Items]      
Ownership percentage 20.00%    
Amount capitalized $ 100,000,000    
Zhejiang Youchuang Venture Capital Investment Co., Ltd | Joint Venture | Subsequent event      
Subsequent Event [Line Items]      
Ownership percentage 80.00%    
Payment for investment $ 90,000,000    
Zhejiang Youchuang Venture Capital Investment Co., Ltd | Ekso Bionics Holdings, Inc | Subsequent event      
Subsequent Event [Line Items]      
Payment for investment 5,000,000    
Equity investments 10,000,000    
Zhejiang Youchuang Venture Capital Investment Co., Ltd | Subsequent event      
Subsequent Event [Line Items]      
Financing receivable 5,000,000    
Angel Pond Capital LLC      
Subsequent Event [Line Items]      
Payment to related party     $ 90
Angel Pond Capital LLC | Subsequent event      
Subsequent Event [Line Items]      
Payment to related party $ 1,000,000