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Commitment and Contingencies - Commitment Narrative (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Long-term Purchase Commitment [Line Items]  
Purchase obligation $ 1,218 [1]
Accrued current liabilities  
Long-term Purchase Commitment [Line Items]  
Commitment to suppliers included in accrued current liabilities 1,000
Contractual obligations under license agreements included in accrued current liabilities 200
License agreements  
Long-term Purchase Commitment [Line Items]  
Contractual obligation $ 1,300
[1] Purchase obligations consist of non-cancelable purchase commitments to suppliers.