Quarterly report pursuant to Section 13 or 15(d)

Merger And Acquisition - Schedule of Preliminary Purchase Price Allocation to Assets Acquired and Liabilities Assumed in Transaction (Detail)

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Merger And Acquisition - Schedule of Preliminary Purchase Price Allocation to Assets Acquired and Liabilities Assumed in Transaction (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Feb. 10, 2017
Dec. 31, 2016
Fair Value of Assets Acquired:      
Cash   $ 56  
Securities available-for-sale   1,111  
Other current assets   93  
Unproved properties   13,000  
Wells in progress $ 332 332  
Land, buildings and equipment, net   67  
Other long-term assets   19  
Total assets acquired   14,678  
Fair Value of Liabilities Assumed:      
Accounts payable and other liabilities   4,393  
Notes payable   8  
Total liabilities assumed   4,401  
Total net assets acquired   10,277  
Goodwill as a result of the Merger $ 1,190 $ 77,592 $ 1,190