Annual report pursuant to Section 13 and 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)
$ in Thousands
Feb. 10, 2017
USD ($)
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
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 $ 77,592