Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional Information (Details)

v3.19.2
Stockholders' Equity - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
May 14, 2019
Jan. 22, 2019
Mar. 31, 2019
Feb. 28, 2019
Jan. 31, 2019
Jun. 30, 2019
Jun. 30, 2019
Feb. 26, 2019
Public offering (in shares) 11,000,000 5,175,000            
Public offering price (in dollars per share) $ 2.00 $ 1.90            
Gross proceeds from public offering $ 22,000,000 $ 9,800,000            
Net proceeds from public offering $ 20,300,000 $ 9,100,000            
Common stock value           $ 0    
Shares available from award (in shares)     250,000          
Expected vesting period     3 years          
Chief Financial Officer                
Shares available from award (in shares)         56,698      
Award exercise period         5 years      
Award exercise price (in dollars per share)         $ 1.88      
Affiliated Entity                
Warrant terms               10 years
Affiliated Entity | Operations, Management and Maintenance Contract Year One                
Warrant exercise price (in dollars per share)               $ 5.00
Number of shares issued at anniversary (in shares)               2,000,000
Affiliated Entity | Operations, Management and Maintenance Contract Year Two                
Warrant exercise price (in dollars per share)               $ 7.00
Number of shares issued at anniversary (in shares)               2,000,000
Warrant                
Warrants issued (in shares)   103,500            
Percentage of warrants issued   2.00%            
Total shares sold   $ 5,175,000            
Warrant exercise price (in dollars per share)   $ 1.90            
Percentage of warrant exercise price   100.00%            
Post-modification warrant expiration date             Jan. 22, 2024  
Veolia North America Regeneration Services, LLC                
Common stock value             $ 1,700,000  
Clarios                
Common stock value             $ 1,300,000  
Stephen Cotton                
Shares available from award (in shares)       1,260,000.00 232,461      
Award exercise period         5 years      
Award exercise price (in dollars per share)         $ 1.88      
Expected vesting period       3 years        
Option One                
Shares available from award (in shares)     125,000          
Award exercise period     5 years          
Award exercise price (in dollars per share)     $ 3.79          
Option One | Stephen Cotton                
Shares available from award (in shares)       420,000        
Award exercise period       5 years        
Award exercise price (in dollars per share)       $ 3.08        
Option Two                
Shares available from award (in shares)     62,500          
Award exercise period     5 years          
Award exercise price (in dollars per share)     $ 4.39          
Option Two | Stephen Cotton                
Shares available from award (in shares)       420,000        
Award exercise period       5 years        
Award exercise price (in dollars per share)       $ 3.68        
Option Three                
Shares available from award (in shares)     62,500          
Award exercise period     5 years          
Award exercise price (in dollars per share)     $ 4.89          
Option Three | Stephen Cotton                
Shares available from award (in shares)       420,000        
Award exercise period       5 years        
Award exercise price (in dollars per share)       $ 4.18        
2019 Plan                
Shares available from award (in shares)             25,000  
Award exercise period             5 years  
Award exercise price (in dollars per share)           $ 1.95 $ 1.95  
Expected vesting period             3 years  
2019 Plan | Board Members                
Shares available from award (in shares)             172,915  
Award exercise period             5 years  
Award exercise price (in dollars per share)           $ 2.48 $ 2.48  
Expected vesting period             12 months  
Common Stock | Prior Company Executives                
Common stock issued during period (in shares)             201,526  
Common Stock | Board Members                
Common stock issued during period (in shares)             115,731  
Common Stock | Veolia North America Regeneration Services, LLC                
Common stock issued during period (in shares)             597,485  
Common Stock | Prior Company Executives                
Common stock issued during period (in shares)             60,261  
Common Stock | Clarios                
Common stock issued during period (in shares)             807,436  
Restricted Stock Units (RSUs)                
Restricted stock units granted (in shares)         261,455      
Restricted stock units grant date fair value         $ 490,000