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Income Taxes - Unrecognized tax benefits (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Abstract]
Tax expense (benefits) related to interest and penalties	$ 12,000	$ 200,000
Amount of interest and penalties	36,000	0
Reconciliation of the beginning and ending amount of unrecognized tax benefits
Beginning unrecognized tax benefits		176,000
Additions from merger	687,000
Reductions for tax positions taken in prior years	(63,000)	$ (176,000)
Ending unrecognized tax benefits	$ 624,000

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The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
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The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of increase in unrecognized tax benefits resulting from acquisitions.

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