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Pelen LLC ("Pelen") Membership Interest (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 01, 2020 | Apr. 24, 2020 | Apr. 30, 2020 | Nov. 30, 2018 | Jan. 31, 2018 | Sep. 30, 2020 | Dec. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Consideration transferred |  | $ 600 |  |  |  |  |
Member of Pelen, LLC | Restricted Stock |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  | 351,637 | 295,082 |  |
Pelen LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Closing stock price (in dollars per share) |  |  |  |  |  |  | $ 0.47
Cash payment |  |  | $ 150 |  |  |  |
Option fee, first year | $ 100 |  |  |  |  |  |
Option term | 1 year |  |  |  |  |  |
Purchase price, first year | $ 3,800 |  |  |  |  |  |
Option fee, second year | 100 |  |  |  |  |  |
Purchase price, second year | 4,400 |  |  |  |  |  |
Option price, third year | 100 |  |  |  |  |  |
Purchase price, third year | $ 5,000 |  |  |  |  |  |
Option payment |  |  |  |  |  | $ 100 |
Sutro Tunnel Company |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Ownership percentage | 100.00% |  |  |  | 100.00% |  |
Pelen LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Ownership percentage | 25.00% |  |  |  |  |  |
Membership interest |  | 25.00% | 25.00% |  | 25.00% |  |
Pelen LLC | Pelen LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Membership interest | 75.00% |  |  |  |  |  |

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