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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&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	1 Months Ended	3 Months Ended
Revenue (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2020	Mar. 31, 2019
Revenue
Revenue accounted for under Topic 606		$ 789	$ 1,703
Collaboration revenue
Revenue
Revenue accounted for under Topic 606		145	1,000
Collaboration revenue - Upfront payment
Revenue
Revenue accounted for under Topic 606		156
Collaboration revenue - Upfront payment \| License Agreement \| Sinovant Sciences, LTD
Revenue
Revenue accounted for under Topic 606	$ 5,000
Collaboration revenue - Variable consideration
Revenue
Revenue accounted for under Topic 606		145	1,000
Research premium
Revenue
Revenue accounted for under Topic 606		290	393
Government grants
Revenue
Revenue accounted for under Topic 606		$ 198	$ 311