Property, Plant and Equipment, Net - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		$ 88,795
Finance lease right-of-use assets	$ 400
Stock-based compensation costs included in capitalized internal-use software and website development costs capitalized	1,300	600	$ 600
ASU 2016-02
Property, Plant and Equipment [Line Items]
Finance lease right-of-use assets				$ 400
Building and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	0	33,277
Building and improvements | ASU 2016-02
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross				$ (33,300)
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	8,393	$ 5,084
Leasehold improvements | ASU 2016-02
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,400