Income Taxes - Narrative (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2020
Income Tax Contingency [Line Items]
Income tax expense (benefit)	$ 15	$ 46	$ 15	$ 125
Effective income tax benefit rate	(0.20%)	(0.90%)	(0.10%)	(1.10%)
Scenario, Forecast
Income Tax Contingency [Line Items]
Effective income tax benefit rate					(0.10%)