Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
-Paragraph 2A
-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045

Name:	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
Revenue (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue	$ 18,027	$ 9,361
Accounting Standards Update 2014-09 \| Difference between Revenue Guidance in Effect before and after Topic 606
Disaggregation of Revenue [Line Items]
Revenue	(138)	(2,114)
Implants \| Contracted rate \| Third party distributor
Disaggregation of Revenue [Line Items]
Revenue	10,749	297
Implants \| Estimated payments \| Third party distributor
Disaggregation of Revenue [Line Items]
Revenue	1,008	6,385
Biopsy kits \| Direct bill
Disaggregation of Revenue [Line Items]
Revenue	436	439
Epicel \| Direct bill
Disaggregation of Revenue [Line Items]
Revenue	$ 5,972	$ 4,354
License Grants, Milestone And Royalty Payments \| Innovative Cellular Therapeutics
Disaggregation of Revenue [Line Items]
Revenue			$ 1,200