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Fair Value Disclosures - Additional Information (Detail) - Comstock Growth Fund One And Two [Member] - Series C- Non Convertible Preferred Stock [Member]
Sep. 30, 2019
$ / shares
shares
Fair Value, Option, Quantitative Disclosures [Line Items]  
Convertible preferred shares issued upon conversion | shares 2,220,690
Preferred stock liquidation value per share | $ / shares $ 5.00