Income Taxes - Summary of liability for unrecognized tax benefits reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of the beginning and ending liabilities for unrecognized tax benefits
Balance at beginning of period	$ 327	$ 751
Gross increases in current period tax positions	31	25
Settlements with taxing authorities	(88)	0
Reductions in tax positions due to lapse of statutory limitations	(118)	(8)
Reclass from unrecognized tax benefits to deferred tax liability	0	(441)
Balance at end of period	152	327
Accrued interest and penalties at end of period	24	48
Total liability for unrecognized tax benefits	$ 176	$ 375