Related-party Transactions (Details Textual) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Research and development	$ 123,037	$ 117,662
Current payables to related parties	3,797	2,200	$ 0
Key management Personnel Compensation Director	135	135
Research and Development [Member]
Research and development	2,200	2,200
VST [Member]
Purchases of goods, related party transactions		$ 522
Current payables to related parties	1,597
VST [Member] \| Research and Development [Member]
Purchases of goods, related party transactions	$ 1,597

The amount of compensation paid to directors.

No definition available.

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- Definition

The amount of goods purchased by the entity in related party transactions. [Refer: Related parties [member]]

+ References

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- Definition

The amount of expenditure directly attributable to research or development activities, recognised in profit or loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of current payables due to related parties. [Refer: Related parties [member]; Payables to related parties]

+ References

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- Details

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