Stock-Based Compensation - Summary of Stock-Based Compensation Expense by Type (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Stock Based Compensation [Line Items]
Total	$ 562	$ 882
Service-based Awards [Member]
Stock Based Compensation [Line Items]
Total	422	580
Performance-based Awards - Short-term Incentive Plan [Member]
Stock Based Compensation [Line Items]
Total	0	189
Performance-based Awards - Long-term Incentive Plan [Member]
Stock Based Compensation [Line Items]
Total	78	57
Employee Stock Purchase Plan [Member]
Stock Based Compensation [Line Items]
Total	62	55
Stock Options [Member]
Stock Based Compensation [Line Items]
Total	$ 0	$ 1