Quarterly report pursuant to Section 13 or 15(d)

Equity (Details)

v3.21.2
Equity (Details) - USD ($)
 1 Months Ended 9 Months Ended
Apr. 24, 2020
Dec. 31, 2020
Aug. 31, 2020
Jun. 19, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2020
Apr. 30, 2020
Mar. 14, 2017
Equity (Details) [Line Items]                  
Sale of common stock, shares (in Shares) 4,300,000                
Gross proceeds           $ 54,705,000      
Warrants to purchase shares of common stock (in Shares) 2,800,000                
Public offering each share of common stock (in Dollars per share) $ 4.5                
Each pre-funded warrant (in Dollars per share) 4.497                
Exercise price of warrant (in Dollars per share) $ 0.003     $ 0.003   $ 0.003 $ 15.62 $ 26.4  
Gross proceeds $ 31,600,000                
Net proceeds of public offering $ 29,100,000                
Issuance of common stock (in Shares)           200,000      
Unrecognized compensation expense         $ 5,400,000        
Weighted average term         3 years 6 months        
Compensation expense related to stock options         $ 1,000,000 $ 800,000      
Outstanding warrant to purchase shares of common stock, issued (in Shares)                 1,907
Deemed dividend to common stockholders           $ 1,000      
Capital on Demand Sales Agreement [Member]                  
Equity (Details) [Line Items]                  
Aggregate value of common stock     $ 200,000,000            
Sale of common stock, shares (in Shares)   2,100,000     4,500,000        
Gross proceeds   $ 22,600,000     $ 35,600,000        
Net proceeds   $ 21,700,000     $ 34,500,000        
Equity Option [Member]                  
Equity (Details) [Line Items]                  
Stock options granted (in Shares)         880,000        
Stock option term         10 years        
Vesting period of stock option         4 years        
Aggregate fair value         $ 3,900,000        
Stock option, description         (1) discount rate range from 0.65% to 1.07% (2) expected life of 6 years, (3) expected volatility range from 79.8% to 85.1%, and (4) no expected dividends. During the nine months ended September 30, 2021, options to purchase 1 thousand shares were exercised and options to purchase 268 thousand shares were cancelled upon the termination of employment for several employees.        
Minimum [Member] | Equity Option [Member]                  
Equity (Details) [Line Items]                  
Exercise price         $ 6.02        
Maximum [Member] | Equity Option [Member]                  
Equity (Details) [Line Items]                  
Exercise price         $ 9.25        
Pre-Funded Warrants [Member]                  
Equity (Details) [Line Items]                  
Exercise price of warrant (in Dollars per share)           $ 0.003      
Gross proceeds       $ 25,000,000          
Net proceeds of public offering       $ 23,000,000          
Issuance of common stock (in Shares)       1,900,000   1,400,000      
Warrants exercised (in Shares)           1,400,000      
Warrant to purchase of common stock (in Shares)       700,000          
Exercise price per share (in Dollars per share)           $ 0.003      
Pre-funded warrants outstanding (in Shares)           1,800,000      
Common Stock [Member]                  
Equity (Details) [Line Items]                  
Share price (in Dollars per share)       $ 9.75          
Warrant [Member]                  
Equity (Details) [Line Items]                  
Share price (in Dollars per share)       $ 9.747