Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Feb. 05, 2021	Dec. 31, 2020	Sep. 30, 2020
Goodwill [Line Items]
Balance at the beginning of the period, gross	$ 4,980			$ 4,980
Accumulated impairment at the beginning of the period	(1,003)			(1,003)
Balance at the end of the period	6,145	$ 1,948	$ 3,977	$ 3,977
Optelian and RIFT Acquisitions
Goodwill [Line Items]
Goodwill from acquisitions	$ 2,168