Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Goodwill And Intangible Asset [Line Items]
Goodwill, accumulated impairment loss	$ 1,003	$ 1,003
Intangible assets net excluding goodwill	5,409		$ 3,377
Amortization of intangible assets	1,295	$ 2,331
Optelian Access Networks Corporation
Goodwill And Intangible Asset [Line Items]
Goodwill from acquisitions	1,900
RIFT Inc
Goodwill And Intangible Asset [Line Items]
Goodwill from acquisitions	200
Optelian and RIFT Acquisitions
Goodwill And Intangible Asset [Line Items]
Goodwill from acquisitions	2,168
Optelian and RIFT Acquisitions | Developed Technology
Goodwill And Intangible Asset [Line Items]
Intangible assets net excluding goodwill	1,900
Optelian and RIFT Acquisitions | Customer Relationships
Goodwill And Intangible Asset [Line Items]
Intangible assets net excluding goodwill	500
Optelian and RIFT Acquisitions | In-Process Research And Development
Goodwill And Intangible Asset [Line Items]
Intangible assets net excluding goodwill	$ 900