Quarterly report pursuant to Section 13 or 15(d)

Offerings of Common Stock and Warrants and At-the-Market Offering Program - Common Stock and Warrants (Details)

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Offerings of Common Stock and Warrants and At-the-Market Offering Program - Common Stock and Warrants (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 04, 2019
Dec. 31, 2020
Dec. 31, 2019
Offerings of Common Stock and Warrants and At-the-Market Offering Program      
Registered Direct Offering, common stock, aggregate shares offered, shares (in shares) 580,000    
Registered Direct Offering, common stock, aggregate shares offered, share price (in dollars per share) $ 5.00    
Proceeds from issuance of common stock and warrants, Registered Direct Offering $ 5,100    
Proceeds from issuance of common stock and warrants, net of offering costs $ 4,600 $ 1,402 $ 7,260