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Leases - Supplemental unaudited consolidated balance sheet information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Jan. 01, 2019
Supplemental unaudited consolidated balance sheet information
Operating lease right-of-use assets	$ 8,768	$ 9,200
Operating lease liabilities noncurrent	7,852
Operating lease liabilities	$ 10,927	$ 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	$ 323
ROU assets obtained in exchange for new operating lease liabilities	387
Other Accrued Expenses
Supplemental unaudited consolidated balance sheet information
Operating lease liabilities current	3,075
Long Term Lease Liabilities
Supplemental unaudited consolidated balance sheet information
Operating lease liabilities noncurrent	$ 7,852

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

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

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Weighted average discount rate for operating lease calculated at point in time.

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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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