Quarterly report pursuant to Section 13 or 15(d)

Warrant Derivative Liability, Private Placement (Details)

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Warrant Derivative Liability, Private Placement (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 9 Months Ended
Jan. 08, 2019
Dec. 12, 2018
Dec. 31, 2018
Sep. 30, 2019
Nov. 30, 2018
Private Placement Offering [Abstract]          
Units issued in private placement offering (in shares)   1,425,641      
Unit price (in dollars per share)   $ 1.95      
Gross proceeds from private placement offering   $ 2,800      
Share issuance costs   100      
Net proceeds from private placement offering   $ 2,700      
Cash payable if warrants settled in cash       $ 300  
Warrant [Member]          
Private Placement Offering [Abstract]          
Number of shares issuable per unit (in shares)   0.5     0.5
Warrants, exercisable period       2 years  
Warrants, exercise price (in dollars per share)       $ 3.90  
Common Stock [Member]          
Private Placement Offering [Abstract]          
Number of shares issuable per unit (in shares)   1     1
Net proceeds from private placement offering $ 100   $ 2,600    
Shares issued in private placement offering (in shares) 25,641   1,400,000 5,745,000  
Number of warrants issuable if settled in shares       712,823