Quarterly report pursuant to Section 13 or 15(d)

Equity (Details)

v3.21.1
Equity (Details) - USD ($)
shares in Thousands, $ in Millions
1 Months Ended 3 Months Ended
Dec. 31, 2020
Aug. 31, 2020
Oct. 31, 2018
Mar. 31, 2021
Mar. 31, 2020
Equity (Details) [Line Items]          
Compensation expense       $ 0.4 $ 0.4
Stock Options Member          
Equity (Details) [Line Items]          
Unrecognized compensation expense       $ 3.8  
Weighted average period       3 years 73 days  
Lincoln Park Capital Fund, LLC [Member]          
Equity (Details) [Line Items]          
Aggregate value of common stock         $ 0.2
Sale of common stock, shares (in Shares)         27
Capital on Demand Sales Agreement [Member]          
Equity (Details) [Line Items]          
Aggregate value of common stock   $ 200.0      
Sale of common stock, shares (in Shares) 2,100     1,700  
Gross Proceeds $ 22.6     $ 14.8  
Net Proceeds $ 21.7     $ 14.4  
Market Issuance Sales Agreement [Member]          
Equity (Details) [Line Items]          
Sale of common stock, shares (in Shares)         300
Net Proceeds         $ 2.5
Purchase Agreement [Member] | Lincoln Park Capital Fund, LLC [Member]          
Equity (Details) [Line Items]          
Aggregate value of common stock     $ 32.5