Provision for Income Taxes - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Details) - 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
Beginning balance	$ 1,084	$ 622
Additions (decreases) for tax positions taken in a prior year	(7)	8
Additions for tax positions taken in current year	1,088	454
Ending balance	$ 2,165	$ 1,084