Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue component	$ 28,854	$ 19,471	$ 69,584	$ 43,217
Earnings from equity method investments	22,195	9,518	61,944	25,959
Total revenues from customers and earnings from equity method investments	28,854	19,471	69,584	43,217
Total revenues from customers and earnings from equity method investments	51,049	28,989	131,528	69,176
Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues from customers and earnings from equity method investments	51,049	28,989	131,528	69,176
Consumables
Disaggregation of Revenue [Line Items]
Revenue component	24,689	15,844	57,696	33,231
License royalties, related party
Disaggregation of Revenue [Line Items]
Revenue component	4,165	3,627	11,888	9,986
APT
Disaggregation of Revenue [Line Items]
Revenue component	24,689	15,844	57,696	33,231
Earnings from equity method investments	0	0	0	0
APT \| Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues from customers and earnings from equity method investments	24,689	15,844	57,696	33,231
APT \| Consumables
Disaggregation of Revenue [Line Items]
Revenue component	24,689	15,844	57,696	33,231
APT \| Consumables \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenue component	24,689	15,844	57,696	33,231
APT \| License royalties, related party
Disaggregation of Revenue [Line Items]
Revenue component	0	0	0	0
RC
Disaggregation of Revenue [Line Items]
Revenue component	4,165	3,627	11,888	9,986
Earnings from equity method investments	22,195	9,518	61,944	25,959
RC \| Operating Segments
Disaggregation of Revenue [Line Items]
Earnings from equity method investments	22,195	9,518	61,944	25,959
Total revenues from customers and earnings from equity method investments	26,360	13,145	73,832	35,945
RC \| Consumables
Disaggregation of Revenue [Line Items]
Revenue component	0	0	0	0
RC \| License royalties, related party
Disaggregation of Revenue [Line Items]
Revenue component	$ 4,165	$ 3,627	$ 11,888	$ 9,986