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Leases - Supplemental unaudited consolidated balance sheet information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jan. 01, 2019
Supplemental unaudited consolidated balance sheet information
Operating lease right-of-use assets	$ 8,278	$ 9,200
Operating lease liabilities current	2,624
Operating lease liabilities noncurrent	7,474
Operating lease liabilities	$ 10,098	$ 11,000
Weighted average remaining lease term	5 years 9 months 18 days
Weighted-average discount rate	4.90%
Supplemental unaudited interim consolidated cash flow information
Operating cash flows from operating leases	$ 1,754
ROU assets obtained in exchange for new operating lease liabilities	$ 555

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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