XML 29 R45.htm IDEA: XBRL DOCUMENT v3.20.1
Goodwill & Intangibles - Additional Information (Detail) - USD ($)
3 Months Ended
Jul. 17, 2017
Mar. 31, 2020
Dec. 31, 2019
Schedule Of Goodwill And Intangible Assets [Line Items]      
Impairment to goodwill   $ 0  
Goodwill   1,702,000 $ 1,702,000
General and Administrative Expense [Member]      
Schedule Of Goodwill And Intangible Assets [Line Items]      
Intangible asset amortization   $ 17,000  
Customer Relationships [Member]      
Schedule Of Goodwill And Intangible Assets [Line Items]      
Amortization period of intangible assets   4 years  
Comstock Environmental [Member]      
Schedule Of Goodwill And Intangible Assets [Line Items]      
Purchase price of business assets $ 2,300,000