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Additional Balance Sheet Information - Components of Balance Sheet Amounts (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Accounts Receivable:    
Joint interest billings $ 2,345 $ 2,667
Trade receivables 1,070 1,452
Oil and gas sales 4,078 3,576
Other 204 2,377
Accounts Receivable, Gross 7,697 10,072
Less: Allowance for doubtful accounts (297) (529)
Total 7,400 9,543
Accounts Payable:    
Trade 3,967 3,289
Royalty and other owners 5,909 5,973
Partner advances 592 1,083
Prepaid drilling deposits 83 390
Other 1,414 1,620
Total 11,965 12,355
Accrued Liabilities:    
Compensation and related expenses 2,295 2,294
Property costs 3,317 3,302
Income tax 1,988  
Other 584 526
Total $ 8,184 $ 6,122