Income Taxes - Schedule of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at the beginning of year	$ 1,128	$ 1,006
Increase (decrease) related to prior year tax positions	47	(77)
Increase related to current year tax positions	264	199
Balance at the end of year	$ 1,439	$ 1,128