Stockholders' Equity - Schedule of Pre-2017 Non-Qualified Stock Options Nonvested Share Activity (Details) - Employee Stock Option - Pre-2017 Non-Qualified Stock Options	3 Months Ended
	Oct. 31, 2017 $ / shares shares
Number of Shares
Non-vested, beginning balance (in shares) | shares	339,871
Vested (in shares) | shares	(46,249)
Non-vested, ending balance (in shares) | shares	293,622
Weighted Average Grant Date Fair Value Per Share
Non-vested, beginning balance (in dollars per share) | $ / shares	$ 7.93
Vested (in dollars per share) | $ / shares	9.46
Non-vested, ending balance (in dollars per share) | $ / shares	$ 7.94