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Summary of Significant Accounting Policies - Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2018	Dec. 31, 2019	Jan. 01, 2019
Adoption of new accounting pronouncements
Lease, Practical Expedients, Package [true false]	true
Operating lease expense		$ 4,900
Operating lease right-of-use assets	$ 11,356		$ 10,580
Operating lease liabilities	15,254		13,935
Retained earnings	$ 173,731		$ 179,440
Accounting Standards Update 2016-02 | Adjustments.
Adoption of new accounting pronouncements
Operating lease right-of-use assets				$ 9,200
Operating lease liabilities				11,000
Retained earnings				$ 0
General and administrative expense.
Adoption of new accounting pronouncements
Lease exit costs		$ 300

X

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.

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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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