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Stock-Based Compensation - Additional Information (Detail) $ in Millions						12 Months Ended
	Feb. 28, 2019	May 16, 2018 Director shares	May 17, 2017 Director shares	May 18, 2016 Director shares	May 11, 2015 Director shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
May 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock expense								$ 0.3
May 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock expense							$ 0.2	$ 0.3
May 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock expense						$ 0.1	0.2
May 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock expense						$ 0.3
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation awards, requisite service period						3 years
Restricted Stock [Member] \| May 2015 [Member] \| Board of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares of common stock issued \| shares					8,833
Number of non employee directors \| Director					7
Restricted Stock [Member] \| May 2016 [Member] \| Board of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares of common stock issued \| shares				9,963
Number of non employee directors \| Director				3
Restricted Stock [Member] \| May 2017 [Member] \| Board of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares of common stock issued \| shares			10,212
Number of non employee directors \| Director			3
Restricted Stock [Member] \| May 2018 [Member] \| Board of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost						$ 0.1
Restricted shares of common stock issued \| shares		15,476
Number of non employee directors \| Director		3
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						$ 4.0
Weighted average period for shares 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						$ 3.5
Weighted average period for shares to vest						1 year
Fair value of performance stock units vested							$ 0.8
BRMR and Everest Merger Sub Inc. [Member] \| Common Stock [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reverse stock split, description	15-to-1
Reverse stock split	0.066
2014 Long-Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized to be issue \| shares						25,000,000
Number of shares are available for future grant \| shares						7,145,866