Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Beginning Balance	$ 94,987,000	$ 95,031,000
Acquisitions		0
Foreign exchange adjustments	205,000	(44,000)
Ending Balance	95,192,000	94,987,000	$ 95,031,000
Accumulated goodwill impairment charges	23,500,000
Goodwill impairment recognized	0	0	0
Business
Goodwill [Roll Forward]
Beginning Balance	86,963,000	87,007,000
Acquisitions		0
Foreign exchange adjustments	205,000	(44,000)
Ending Balance	87,168,000	86,963,000	87,007,000
Consumer
Goodwill [Roll Forward]
Beginning Balance	8,024,000	8,024,000
Acquisitions		0
Foreign exchange adjustments	0	0
Ending Balance	$ 8,024,000	$ 8,024,000	$ 8,024,000

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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