Income Taxes (Tables)
 12 Months Ended
Jul. 31, 2016
Income Taxes [Abstract]  
Summary of (provision for) benefit from income taxes
Year ended July 31,         
(in thousands) 2016  2015  2014 
Current:         
Federal $39  $—  $21 
State and local  (35)  (34)  6 
   4   (34)  27 
Deferred:            
Federal  —   (2,211)  1,925 
State and local  —   (469)  401 
   —   (2,680)  2,326 
BENEFIT FROM (PROVISION FOR) INCOME TAXES $4  $(2,714) $2,353 
Summary of deferred income tax assets and liabilities
July 31,
(in thousands)		 2016  2015 
Deferred income tax assets (liabilities):      
Net operating loss carryforward $57,098  $53,383 
Accrued expenses  338   314 
Stock based compensation  (464)  (329)
Deferred revenue on litigation settlements  -   313 
Valuation allowance  (56,972)  (53,681)
TOTAL NET DEFERRED INCOME TAX ASSETS (LIABILITIES) $—  $— 
Schedule of differences between income taxes expected at the federal statutory income tax rate and income taxes
Year ended July 31,         
(in thousands) 2016  2015  2014 
Federal income tax at statutory rate $(2,939) $(262) $99 
Permanent differences  2   1,048   — 
Valuation allowance  3,394   (3,500)  2,250 
Other  3   —   — 
State and local income tax, net of federal benefit  (456)  —   4 
PROVISION FOR (INCOME TAXES) INCOME TAX BENEFITS $4  $(2,714) $2,353 
Schedule of change in the valuation allowance for deferred income taxes
Year ended July 31, (in thousands) Balance at
beginning of
year		  Additions
charged to
costs and
expenses		  Deductions  Balance at
end of year		 
2016            
Reserves deducted from deferred income taxes, net:            
Valuation allowance $53,681  $3,394  $(103) $56,972 
                 
2015                
Reserves deducted from deferred income taxes, net:                
Valuation allowance $50,191  $3,500  $(10) $53,681 
                 
2014                
Reserves deducted from deferred income taxes, net:                
Valuation allowance $50,797  $—  $(606) $50,191 
Schedule of unrecognized tax benefits
  Year ended July 31, 
(in thousands) 2016  2015  2014 
Balance at beginning of period $210  $—  $— 
Additions based on tax positions related to the current period      —   — 
Additions for tax positions of prior periods  5   210   — 
Reductions for tax positions of prior periods  —   —   — 
Settlements  —   —   — 
Lapses of statutes of limitations  —   —   — 
Balance at end of period $215  $210  $—