Summary of Significant Accounting Policies - Accounts receivable (Details) $ in Thousands |
Dec. 31, 2018
contract
|
Dec. 31, 2018
customer
|
Dec. 31, 2018
USD ($)
|
Dec. 31, 2017
USD ($)
customer
|
|---|---|---|---|---|
| Accounts receivable | ||||
| Allowance for doubtful accounts | $ 0 | $ 0 | ||
| GlaxoSmithKline Intellectual Property Development Ltd | ||||
| Accounts receivable | ||||
| Number of customers | 1 | 1 | 1 |
| X | ||||||||||
- Definition Represents the number of customers. No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Details
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