Quarterly report pursuant to Section 13 or 15(d)

Equity - Narrative (Details)

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Equity - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended
Feb. 29, 2020
Mar. 31, 2020
Feb. 10, 2020
2015 Stock Plan      
Class of Stock [Line Items]      
Number of shares available for grant (in shares)   4,500,000  
Number of shares remaining to be issued (in shares)   297,093  
Warrants in Connection with February 2020 Stock Offering      
Class of Stock [Line Items]      
Shares purchased from issuance of warrants (in shares) 5,625,000   5,625,000
February 2020 Stock Offering      
Class of Stock [Line Items]      
Number of shares sold (in shares) 7,500,000    
Sale of common stock (in dollars per share) $ 0.80    
Gross proceeds from transaction $ 6.0    
Transaction expenses $ 0.7