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Income Taxes - Summary of liability for unrecognized tax benefits reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of the beginning and ending liabilities for unrecognized tax benefits    
Balance at beginning of period $ 751 $ 271
Gross increases in current period tax positions 25 63
Gross increases in prior period tax positions 0 434
Reductions in tax positions due to lapse of statutory limitations (8) (17)
Reclass from unrecognized tax benefits to deferred tax liability (441) 0
Balance at end of period 327 751
Accrued interest and penalties at end of period 48 36
Total liability for unrecognized tax benefits $ 375 $ 787