Goodwill	9 Months Ended
	Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	Goodwill    Goodwill was $19.0 million and $18.1 million at September 30, 2021 and December 31, 2020, respectively, and has been allocated to the Lightwave segment. The decrease in goodwill of $0.2 million during the three months ended September 30, 2021 was due to foreign currency translation. The decrease in goodwill of $0.9 million during the nine months ended September 30, 2021 was primarily due to measurement period adjustments recorded in the second quarter.