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Summary of Significant Accounting Policies - Leases (Details) - USD ($)	9 Months Ended
	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Adoption of new accounting pronouncements
Lease, Practical Expedients, Package [true false]	true
Operating lease right-of-use assets	$ 10,903,000
Operating lease liabilities	14,228,000
Retained earnings	$ 176,118,000		$ 172,378,000
Accounting Standards Update 2016-02 | Adjustment
Adoption of new accounting pronouncements
Operating lease right-of-use assets		$ 9,200,000
Operating lease liabilities		11,000,000
Retained earnings		$ 0

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Indicates (true false) whether practical expedients are elected for not reassessing whether any expired or existing contract is or contains lease, lease classification for expired or existing lease, and initial direct cost for any existing lease.

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

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Amount of lessee's right to use underlying asset under operating lease.

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