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Common Stock (Details Narrative) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 6 Months Ended
Apr. 14, 2017
Feb. 28, 2017
Feb. 16, 2017
Jan. 19, 2017
Feb. 28, 2017
Jan. 31, 2017
Jun. 30, 2017
Jun. 30, 2016
Net proceeds from direct offering       $ 8,900 $ 4,500 $ 8,900    
Number of common stock sold       1,399,140        
Sale of stock price per share       $ 2.01        
Pre-funded warrants to purchase of common stock, shares       3,426,731        
Pre-funded common stock purchase warrants price, per share       $ 2.00        
Warrant exercise price per share       $ 0.01        
Number of common stock issued value             $ 13,705  
Proceeds from common stock             $ 13,705 $ 5,108
Investor [Member]                
Number of common stock issued   150,000            
Number of common stock issued value   $ 300            
Share issued price per share   $ 2.00     $ 2.00      
ATM Offering [Member]                
Net proceeds from direct offering $ 30,000              
Commission percentage 2.50%              
ATM Offering [Member] | August 11, 2017 [Member]                
Number of common stock sold 468,859              
Proceeds from common stock $ 800              
Available for future sales $ 29,200              
Aspire Capital Fund LLC [Member]                
Net proceeds from direct offering     $ 4,500          
Number of common stock sold     2,100,000          
Sale of stock price per share     $ 1.58          
Pre-funded warrants to purchase of common stock, shares     748,101          
Pre-funded common stock purchase warrants price, per share     $ 1.57          
Warrant exercise price per share     $ 0.01          
Warrants expiration term     3 years