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%