Leases	12 Months Ended
	Dec. 31, 2021
Leases [Abstract]
Leases	7. LEASES We have operating leases primarily consisting of offices and lab space, machinery and equipment and vehicles. The components of lease expense are as follows (in thousands):     For the Years Ended December 31,       2021     2020     2019                        Operating lease expense   $ 17,253     $ 17,848     $ 18,639    Short-term lease expense     1,990       1,801       1,228    Variable lease expense     1,462       1,442       920    Total lease expense   $ 20,705     $ 21,091     $ 20,787    Other Information:                    Operating cash flows from operating leases   $ 16,367     $ 17,049     $ 18,195    Right of use assets obtained in exchange for new operating lease obligations   $ 5,736     $ 5,654     $ 11,688    Weighted-average remaining lease term - operating leases   7.62 years     8.69 years     9.07 years    Weighted-average discount rate - operating leases     4.61 %     4.70 %     4.94 % Scheduled undiscounted lease payments for non-cancellable leases consist of the following (in thousands): 2022   $ 14,674   2023     11,917   2024     9,328   2025     7,969   2026     6,586   Thereafter     22,636   Total undiscounted lease payments   $ 73,110   Less: Imputed interest     (11,482 ) Total lease liabilities   $ 61,628    During the year ended December 31, 2020, the Company recorded $0.5 million on lease abandonment for certain properties that ceased in use and are expected to provide no future economic benefits. There is no lease abandonment cost recorded during the years ended December 31, 2021 and 2019.