Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Product sales, net	$ 26,678	$ 21,810
Revenues	26,678	21,810
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
Disaggregation of Revenue [Line Items]
Product sales, net	1,207	(37)
Through Intermediary | Implants | Contract rate
Disaggregation of Revenue [Line Items]
Product sales, net	11,338	9,787
Through Intermediary | Implants | Time-and-materials contract
Disaggregation of Revenue [Line Items]
Product sales, net	3,730	2,743
Time-and-materials contract | Implants | Time-and-materials contract
Disaggregation of Revenue [Line Items]
Product sales, net	436	322
Provider or Facility | Implants | Contract rate
Disaggregation of Revenue [Line Items]
Product sales, net	3,109	3,226
Directly to consumer | Biopsy kits
Disaggregation of Revenue [Line Items]
Product sales, net	466	542
Directly to consumer | Epicel
Disaggregation of Revenue [Line Items]
Product sales, net	$ 6,392	$ 5,227