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Stockholders' Equity - Additional Information (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 14, 2019 | Jan. 22, 2019 | Sep. 30, 2019 | Aug. 31, 2019 | Jul. 31, 2019 | May 31, 2019 | Mar. 31, 2019 | Feb. 28, 2019 | Jan. 31, 2019 | Sep. 30, 2019 | Sep. 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 |  |  |  |  |  |  |  |  |  |
Expected vesting period |  |  |  |  |  |  |  |  |  | 3 years 6 months | 3 years 6 months |
2019 Plan, Option One |  |  |  |  |  |  |  |  |  |  |  |
Shares available from award (in shares) |  |  |  |  | 150,000 |  |  |  |  |  |  |
Award exercise period |  |  |  |  | 5 years |  |  |  |  |  |  |
Award exercise price (in dollars per share) |  |  |  |  | $ 1.65 |  |  |  |  |  |  |
Expected vesting period |  |  |  |  | 3 years |  |  |  |  |  |  |
2019 Plan, Option Two |  |  |  |  |  |  |  |  |  |  |  |
Shares available from award (in shares) |  |  |  |  | 50,000 |  |  |  |  |  |  |
Award exercise period |  |  |  |  | 5 years |  |  |  |  |  |  |
Award exercise price (in dollars per share) |  |  |  |  | $ 1.87 |  |  |  |  |  |  |
Expected vesting period |  |  |  |  | 3 years |  |  |  |  |  |  |
Chief Financial Officer |  |  |  |  |  |  |  |  |  |  |  |
Shares available from award (in shares) |  |  |  |  |  |  | 250,000 |  | 56,698 |  |  |
Award exercise period |  |  |  |  |  |  |  |  | 5 years |  |  |
Award exercise price (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.88 |  |  |
Expected vesting period |  |  |  |  |  |  | 3 years |  |  |  |  |
Chief Financial Officer | Option One |  |  |  |  |  |  |  |  |  |  |  |
Shares available from award (in shares) |  |  |  |  |  |  | 125,000 |  |  |  |  |
Award exercise period |  |  |  |  |  |  | 5 years |  |  |  |  |
Award exercise price (in dollars per share) |  |  |  |  |  |  | $ 3.79 |  |  |  |  |
Chief Financial Officer | Option Two |  |  |  |  |  |  |  |  |  |  |  |
Shares available from award (in shares) |  |  |  |  |  |  | 62,500 |  |  |  |  |
Award exercise period |  |  |  |  |  |  | 5 years |  |  |  |  |
Award exercise price (in dollars per share) |  |  |  |  |  |  | $ 4.39 |  |  |  |  |
Chief Financial Officer | Option Three |  |  |  |  |  |  |  |  |  |  |  |
Shares available from award (in shares) |  |  |  |  |  |  | 62,500 |  |  |  |  |
Award exercise period |  |  |  |  |  |  | 5 years |  |  |  |  |
Award exercise price (in dollars per share) |  |  |  |  |  |  | $ 4.89 |  |  |  |  |
Share-based Compensation Award, Tranche One | Chief Financial Officer |  |  |  |  |  |  |  |  |  |  |  |
Award exercise percentage |  |  |  |  |  |  | 33.33% |  |  |  |  |
Share-based Compensation Award, Tranche Two | Chief Financial Officer |  |  |  |  |  |  |  |  |  |  |  |
Award exercise percentage |  |  |  |  |  |  | 33.33% |  |  |  |  |
Share-based Compensation Award, Tranche Three | Chief Financial Officer |  |  |  |  |  |  |  |  |  |  |  |
Award exercise percentage |  |  |  |  |  |  | 33.33% |  |  |  |  |
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 |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |
Award exercise period |  |  |  |  |  |  |  |  | 3 years |  |  |
Restricted stock units granted (in shares) |  |  | 59,414 | 134,419 |  |  |  |  | 261,455 |  |  |
Restricted stock units grant date fair value |  |  | $ 109,000 | $ 231,000 |  |  |  |  | $ 490,000 |  |  |
Restricted Stock Units (RSUs) | Share-based Compensation Award, Tranche One |  |  |  |  |  |  |  |  |  |  |  |
Award exercise percentage |  |  |  |  |  |  |  |  | 16.67% |  |  |
Restricted Stock Units (RSUs) | Share-based Compensation Award, Tranche Two |  |  |  |  |  |  |  |  |  |  |  |
Award exercise percentage |  |  |  |  |  |  |  |  | 16.67% |  |  |
Restricted Stock Units (RSUs) | Share-based Compensation Award, Tranche Three |  |  |  |  |  |  |  |  |  |  |  |
Award exercise percentage |  |  |  |  |  |  |  |  | 16.67% |  |  |
Restricted Stock Units (RSUs) | Share-based Compensation Award, Tranche Four |  |  |  |  |  |  |  |  |  |  |  |
Award exercise percentage |  |  |  |  |  |  |  |  | 16.67% |  |  |
Restricted Stock Units (RSUs) | Share-based Compensation Award, Tranche Five |  |  |  |  |  |  |  |  |  |  |  |
Award exercise percentage |  |  |  |  |  |  |  |  | 16.67% |  |  |
Restricted Stock Units (RSUs) | Share-based Compensation Award, Tranche Six |  |  |  |  |  |  |  |  |  |  |  |
Award exercise percentage |  |  |  |  |  |  |  |  | 16.67% |  |  |
Prior Company Executives | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued during period (in shares) |  |  |  |  |  |  |  |  |  |  | 233,646 |
Board Members | 2019 Plan |  |  |  |  |  |  |  |  |  |  |  |
Shares available from award (in shares) |  |  |  |  |  | 172,915 |  |  |  |  |  |
Award exercise period |  |  |  |  |  | 5 years |  |  |  |  |  |
Award exercise price (in dollars per share) |  |  |  |  |  | $ 2.48 |  |  |  |  |  |
Expected vesting period |  |  |  |  |  | 12 months |  |  |  |  |  |
Board Members | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued during period (in shares) |  |  |  |  |  |  |  |  |  |  | 142,345 |
Board Members | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units granted (in shares) |  |  |  |  | 60,560 |  |  |  |  |  |  |
Restricted stock units grant date fair value |  |  |  |  | $ 97,500 |  |  |  |  |  |  |
Veolia North America Regeneration Services, LLC |  |  |  |  |  |  |  |  |  |  |  |
Common stock value |  |  |  |  |  |  |  |  |  |  | $ 2,700,000 |
Veolia North America Regeneration Services, LLC | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued during period (in shares) |  |  |  |  |  |  |  |  |  |  | 891,235 |
Prior Company Executives | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued during period (in shares) |  |  |  |  |  |  |  |  |  |  | 110,775 |
Clarios |  |  |  |  |  |  |  |  |  |  |  |
Common stock value |  |  |  |  |  |  |  |  |  |  | $ 1,300,000 |
Clarios | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued during period (in shares) |  |  |  |  |  |  |  |  |  |  | 807,436 |
Stephen Cotton | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |
Stephen Cotton | Chief Executive Officer | Option One |  |  |  |  |  |  |  |  |  |  |  |
Shares available from award (in shares) |  |  |  |  |  |  |  | 420,000 |  |  |  |
Award exercise period |  |  |  |  |  |  |  | 5 years |  |  |  |
Award exercise price (in dollars per share) |  |  |  |  |  |  |  | $ 3.08 |  |  |  |
Stephen Cotton | Chief Executive Officer | Option Two |  |  |  |  |  |  |  |  |  |  |  |
Shares available from award (in shares) |  |  |  |  |  |  |  | 420,000 |  |  |  |
Award exercise period |  |  |  |  |  |  |  | 5 years |  |  |  |
Award exercise price (in dollars per share) |  |  |  |  |  |  |  | $ 3.68 |  |  |  |
Stephen Cotton | Chief Executive Officer | Option Three |  |  |  |  |  |  |  |  |  |  |  |
Shares available from award (in shares) |  |  |  |  |  |  |  | 420,000 |  |  |  |
Award exercise period |  |  |  |  |  |  |  | 5 years |  |  |  |
Award exercise price (in dollars per share) |  |  |  |  |  |  |  | $ 4.18 |  |  |  |
Stephen Cotton | Share-based Compensation Award, Tranche One | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |
Award exercise percentage |  |  |  |  |  |  |  | 33.33% |  |  |  |
Stephen Cotton | Share-based Compensation Award, Tranche Two | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |
Award exercise percentage |  |  |  |  |  |  |  | 33.33% |  |  |  |
Stephen Cotton | Share-based Compensation Award, Tranche Three | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |
Award exercise percentage |  |  |  |  |  |  |  | 33.33% |  |  |  |

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