Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue component	$ 21,097	$ 12,263
Earnings from equity method investments	18,312	8,273
Total revenues from customers and earnings from equity method investments	21,097	12,263
Total revenues from customers and earnings from equity method investments	39,409	20,536
Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues from customers and earnings from equity method investments	39,409	20,536
Consumables
Disaggregation of Revenue [Line Items]
Revenue component	17,031	9,217
License royalties, related party
Disaggregation of Revenue [Line Items]
Revenue component	4,066	3,046
APT
Disaggregation of Revenue [Line Items]
Revenue component	17,031	9,217
Earnings from equity method investments	0	0
APT | Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues from customers and earnings from equity method investments	17,031	9,217
APT | Consumables
Disaggregation of Revenue [Line Items]
Revenue component	17,031	9,217
APT | Consumables | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue component	17,031	9,217
APT | License royalties, related party
Disaggregation of Revenue [Line Items]
Revenue component	0	0
RC
Disaggregation of Revenue [Line Items]
Revenue component	4,066	3,046
Earnings from equity method investments	18,312	8,273
RC | Operating Segments
Disaggregation of Revenue [Line Items]
Earnings from equity method investments	18,312	8,273
Total revenues from customers and earnings from equity method investments	22,378	11,319
RC | Consumables
Disaggregation of Revenue [Line Items]
Revenue component	0	0
RC | License royalties, related party
Disaggregation of Revenue [Line Items]
Revenue component	$ 4,066	$ 3,046