Income Taxes (Tables)

12 Months Ended

Jul. 31, 2017

Income Taxes [Abstract]

Summary of benefit from (provision for) income taxes

Year ended July 31,
(in thousands)	2017			2016			2015
Current:
Federal	$	—		$	39		$	—
State and local		(13	)		(35	)		(34	)
		(13	)		4			(34	)
Deferred:
Federal		—			—			(2,211	)
State and local		—			—			(469	)
		—			—			(2,680	)
INCOME TAX BENEFITS (PROVISION FOR INCOME TAXES)	$	(13	)	$	4		$	(2,714	)

Summary of deferred income tax assets and liabilities

July 31, (in thousands)	2017			2016
Deferred income tax assets (liabilities):
Net operating loss carryforward	$	74,292		$	57,098
Accrued expenses		3,808			338
Stock based compensation		(4,043	)		(464	)
Valuation allowance		(74,057	)		(56,972	)
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)	2017			2016			2015
Federal income tax at statutory rate	$	15,524		$	2,939		$	(262	)
Permanent differences		(759	)		(2	)		1,048
Valuation allowance		(17,085	)		(3,394	)		(3,500	)
Other		15			(3	)		—
State and local income tax, net of federal benefit		2,292			464			—
PROVISION FOR (INCOME TAXES) INCOME TAX BENEFITS	$	(13	)	$	4		$	(2,714	)

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
2017
Reserves deducted from deferred income taxes, net:
Valuation allowance	$	56,972	$	17,085	$	—		$	74,057
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

Schedule of unrecognized income tax benefits

	Year ended July 31,
(in thousands)	2017		2016		2015
Balance at beginning of period	$	215	$	210	$	—
Additions based on tax positions related to the current period		—		—		—
Additions for tax positions of prior periods		6		5		210
Reductions for tax positions of prior periods		—		—		—
Settlements		—		—		—
Lapses of statutes of limitations		—		—		—
Balance at end of period	$	221	$	215	$	210