Investment in Debt Security - Additional Information (Details) - Debt Security - USD ($)	1 Months Ended	12 Months Ended
	Jan. 31, 2021	Dec. 31, 2020	Jul. 13, 2020
Subsequent Event
Schedule Of Available For Sale Securities [Line Items]
Proceeds from sale of bond under purchase agreement	$ 300,000
Additional cash compensation to be received based on conditions met	2,400,000
Repurchase price of bond if conditions not met	$ 1.00
International Seismic Marine | Third in Line lien on Assets
Schedule Of Available For Sale Securities [Line Items]
Face value of debt security			$ 13,000,000.0
Unpaid invoices and later fees owed by customer			$ 13,000,000.0
Debt instrument, description		The bond is secured by a third in line lien on the assets owned by the customer and has an 8% interest rate with bi-annual interest and possible principal payments based on available excess cash flows.  Interest payments can be made either in cash or in-kind payments in the form of additional debt security.  In-kind interest payments require an 8.8% interest rate.
Investment interest rate			8.00%
In-kind payments, interest rate			8.80%
Maturity date			Jul. 13, 2022