Registration of securities issued in business combination transactions

Discontinued Operations (Adjusted carrying amounts of the major classes of assets and liabilities) (Detail)

v3.6.0.2
Discontinued Operations (Adjusted carrying amounts of the major classes of assets and liabilities) (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Aug. 11, 2016
Aug. 01, 2016
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Disposal Group, Including Discontinued Operation, Liabilities [Abstract]            
Contribution to equity from preferred stockholder   $ 9,892        
Gain on disposal of discontinued operations, net of tax $ 1,069   $ 1,069 $ 0    
Discontinued Operations, Held-for-sale            
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract]            
Cash     0   $ 141 $ 282
Accounts receivable     198   249 504
Inventories     537   533 651
Other classes of current assets that are not major     38   34 77
Disposal Group, Including Discontinued Operation, Assets, Noncurrent [Abstract]            
Property and equipment, net     25,089   24,753 36,546
Other classes of assets that are not major     204   332 376
Total assets of the disposal groups     26,066   26,042 38,436
Disposal Group, Including Discontinued Operation, Liabilities [Abstract]            
Accounts payable     2,117   2,264 2,237
Note payable     5,500   5,500 5,500
Asset retirement obligations     2,818   2,818 2,647
Other classes of liabilities that are not major     55   56 104
Total liabilities of the disposal groups     10,490   10,638 10,488
Secured promissory note forgiven 0 625        
Cash received 586 900        
Stock of UKOG received 925 0        
Total consideration 1,511 25,026        
CO2 Business | Discontinued Operations, Held-for-sale            
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract]            
Cash     0   141 282
Accounts receivable     198   249 504
Inventories     242   232 297
Other classes of current assets that are not major     38   34 77
Disposal Group, Including Discontinued Operation, Assets, Noncurrent [Abstract]            
Property and equipment, net     24,294   23,941 35,593
Other classes of assets that are not major     204   332 376
Total assets of the disposal groups     24,976   24,929 37,129
Disposal Group, Including Discontinued Operation, Liabilities [Abstract]            
Accounts payable     1,469   1,594 1,752
Note payable     5,500   5,500 5,500
Asset retirement obligations     2,818   2,818 2,647
Other classes of liabilities that are not major     55   56 104
Total liabilities of the disposal groups     9,842   9,968 10,003
Weald Basin | Discontinued Operations, Held-for-sale            
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract]            
Cash     0   0 0
Accounts receivable     0   0 0
Inventories     295   301 354
Other classes of current assets that are not major     0   0 0
Disposal Group, Including Discontinued Operation, Assets, Noncurrent [Abstract]            
Property and equipment, net     795   812 953
Other classes of assets that are not major     0   0 0
Total assets of the disposal groups     1,090   1,113 1,307
Disposal Group, Including Discontinued Operation, Liabilities [Abstract]            
Accounts payable     648   670 485
Note payable     0   0 0
Asset retirement obligations     0   0 0
Other classes of liabilities that are not major     0   0 0
Total liabilities of the disposal groups     $ 648   $ 670 $ 485
Series A Preferred Stock | Discontinued Operations, Held-for-sale            
Disposal Group, Including Discontinued Operation, Liabilities [Abstract]            
Series A Preferred Stock exchanged $ 0 $ 23,501