Number Of Non Employee Directors on the Eclipse Board.

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Stock-Based Compensation - Additional Information (Detail) $ in Millions						9 Months Ended
	Jun. 19, 2020 Director shares	Oct. 08, 2019 Director shares	Aug. 02, 2019 Director shares	Jun. 18, 2019 Director shares	Feb. 28, 2019 Officer shares	Sep. 30, 2020 USD ($) shares
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation awards, requisite service period						3 years
Unrecognized compensation cost \| $						$ 3.1
Weighted average period for units to vest						1 year
Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation awards, requisite service period						3 years
Unrecognized compensation cost \| $						$ 4.1
Weighted average period for units to vest						2 years
Restricted Stock [Member] \| Officer [Member] \| February 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock issued					70,409
Number of officers \| Officer					2
Restricted Stock [Member] \| Officer [Member] \| February 2019 [Member] \| August 28, 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					25.00%
Restricted Stock [Member] \| Officer [Member] \| February 2019 [Member] \| February 28, 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					25.00%
Restricted Stock [Member] \| Officer [Member] \| February 2019 [Member] \| June 1, 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					50.00%
Restricted Stock [Member] \| Director \| June 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock issued				53,328
Number of non employee directors \| Director				8
Restricted Stock [Member] \| Director \| June 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock issued	58,335
Number of non employee directors \| Director	5
Share-based compensation, vesting date	Jun. 19, 2021
Unrestricted Stock [Member] \| Director \| August 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock issued			26,935
Number of non employee directors \| Director			4
Unrestricted Stock [Member] \| Director \| October 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock issued		22,661
Number of non employee directors \| Director		4
Restricted and Unrestricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost \| $						$ 0.2
2019 Long-Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized to be issue						2,650,000
Number of shares are available for future grants						303,911