Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 6 Months Ended
Jan. 05, 2018
Sep. 30, 2017
Jan. 31, 2021
Jan. 31, 2020
Jul. 31, 2020
Dec. 31, 2014
Jan. 31, 2011
Stockholders' Equity (Details) [Line Items]              
Common stock, par value (in Dollars per share)     $ 0.01   $ 0.01    
Percentage of commission payable on equity offering     3.00%        
Maximum offering price under sales agreement     $ 20,000     $ 20,000  
Common stock available for grant, description     (i) increasing the shares of common stock available for grant under the Amended and Restated 2011 Plan by an additional 4,000,000 shares of common stock bringing the total number of shares available for grant to 9,000,000 shares of common stock and (ii) extending the term of the Amended and Restated 2011 Plan until October 7, 2030.        
Share-based compensation arrangement by share-based payment award, number of shares available for grant (in Shares)     4,623,000        
Compensation cost related to non-vested options     $ 1,079        
Performance share, description     one former executive forfeited a total of 6,000 PSUs one former executive forfeited a total of 14,500 PSUs.      
2011 Plan [Member]              
Stockholders' Equity (Details) [Line Items]              
Share based compensation arrangement by share based payment award restricted stock units (in Shares)             3,000,000
Share-based compensation arrangement by share-based payment award, number of additional shares authorized (in Shares) 2,000,000            
Common stock available for grants (in Shares) 5,000,000            
Common Stock [Member]              
Stockholders' Equity (Details) [Line Items]              
Authorized common stock that may be issued and sold under sales agreement   $ 19,200          
Securities that may be sold under the agreement   $ 150,000