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