Segment Reporting and Geographic Information - Geographic (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue reporting by end-market and geographic region
Net sales	$ 113,202	$ 108,954	$ 97,822	$ 99,371	$ 98,972	$ 126,757	$ 157,779	$ 158,574	$ 419,349	$ 542,082	$ 475,686
Long-lived tangible assets	75,711				80,284				75,711	80,284	85,058
United States
Revenue reporting by end-market and geographic region
Net sales									126,160	125,659	93,433
Long-lived tangible assets	75,187				78,503				75,187	78,503	81,046
China
Revenue reporting by end-market and geographic region
Net sales									71,078	194,032	106,674
Long-lived tangible assets	130				81				130	81	64
EMEA
Revenue reporting by end-market and geographic region
Net sales									57,351	89,102	72,979
Long-lived tangible assets	143				205				143	205	231
Rest Of World
Revenue reporting by end-market and geographic region
Net sales									164,760	133,289	202,600
Long-lived tangible assets	$ 251				$ 1,495				$ 251	$ 1,495	$ 3,717