Quarterly report pursuant to Section 13 or 15(d)

Organization (Details)

v3.19.2
Organization (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
6 Months Ended
May 24, 2019
Jan. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
May 22, 2019
Dec. 31, 2018
Dec. 31, 2017
Subsidiary, Sale of Stock [Line Items]              
Accumulated deficit     $ 180,763     $ 171,146  
Cash used in operations     9,708 $ 12,804      
Exercise price (in dollars per share)         $ 2    
Proceeds from issuance of common stock and warrants, net     16,325 0      
Cash     13,262 $ 13,890   $ 7,655 $ 27,813
Debt covenant, unrestricted cash     4,546        
Unrestricted cash     $ 8,716        
Common Stock              
Subsidiary, Sale of Stock [Line Items]              
Number of shares sold (in shares)   3,067          
Price per share sold (in dollars per share)   $ 1.63          
Underwriting agreement | Common Stock              
Subsidiary, Sale of Stock [Line Items]              
Warrants issued (in shares) 6,667            
Number of shares sold (in shares) 6,667            
Price per share sold (in dollars per share) $ 1.5            
Proceeds from issuance of common stock and warrants, net $ 9,037