Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional Information (Details)

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