Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Product sales, net	$ 20,014	$ 26,151	$ 46,692	$ 47,961
Revenues	20,014	26,151	46,692	47,961
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
Disaggregation of Revenue [Line Items]
Product sales, net	(248)	87	1,095	50
Through Intermediary | Implants | Contract rate
Disaggregation of Revenue [Line Items]
Product sales, net	9,790	12,989	21,218	22,776
Through Intermediary | Implants | Time-and-materials contract
Disaggregation of Revenue [Line Items]
Product sales, net	2,819	3,459	6,335	6,202
Time-and-materials contract | Implants | Time-and-materials contract
Disaggregation of Revenue [Line Items]
Product sales, net	589	281	1,016	603
Provider or Facility | Implants | Contract rate
Disaggregation of Revenue [Line Items]
Product sales, net	1,806	3,450	4,916	6,676
Directly to consumer | Biopsy kits
Disaggregation of Revenue [Line Items]
Product sales, net	348	557	811	1,099
Directly to consumer | Epicel
Disaggregation of Revenue [Line Items]
Product sales, net	$ 4,910	$ 5,328	$ 11,301	$ 10,555