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Property and Equipment, Net - Summary of Property and Equipment for Fixed Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Property Plant And Equipment [Line Items]    
Total: $ 15,008 $ 14,137
Less: accumulated depreciation (10,081) (9,912)
Property and Equipment, net 4,927 4,225
Computer Equipment    
Property Plant And Equipment [Line Items]    
Total: 1,281 1,276
Survey Equipment    
Property Plant And Equipment [Line Items]    
Total: 4,444 4,444
Vehicles    
Property Plant And Equipment [Line Items]    
Total: 463 463
Furniture and Fixtures    
Property Plant And Equipment [Line Items]    
Total: 1,658 1,638
Leasehold Improvements    
Property Plant And Equipment [Line Items]    
Total: 6,363 5,887
Software    
Property Plant And Equipment [Line Items]    
Total: 283 283
Fixed Assets Pending Lease Financing    
Property Plant And Equipment [Line Items]    
Total: $ 516 $ 146