Income Taxes - Summary of Net Operating Loss and Tax Credit Carryforwards (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Tax Credit Carryforward [Line Items]
Unrecognized tax benefits	$ 274	$ 0	$ 0
State
Operating Loss Carryforwards [Line Items]
NOLs, tax effected	541
Federal
Operating Loss Carryforwards [Line Items]
NOLs, tax effected	2,417
Federal | Federal employer FICA tips credit (expire in 2036-2039)
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	691
Federal | Federal research and development tax credit, net of $274 of unrecognized tax benefits (expire in 2035-2039)
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	1,916
Unrecognized tax benefits	$ 274