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Accrued Liabilities (Details) - Accrued liabilities - USD ($)
$ in Thousands
Jan. 31, 2018
Jul. 31, 2017
Accrued liabilities [Abstract]    
Payroll, benefits, and commissions $ 5,217 $ 4,092
Professional fees 825 442
Legal fee expense 1,558 599
Research and development 143 143
Other 1,922 1,444
$ 9,665 $ 6,720