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Business Combinations - Narrative (Details) - Femiline AB and Jonah Anderson - USD ($)
$ in Thousands
Nov. 17, 2017
Mar. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Shares contingently issuable (in shares) 100,000    
Contingent consideration $ 964    
Cash paid for inventory 704    
Inventory fair value 1,498    
Cash consideration $ 1,000    
Equity interest issued or issuable (in shares) 35,714    
Fair market value of Class A ordinary shares issued $ 344    
Novaform      
Business Acquisition [Line Items]      
Accounts payable   $ 400 $ 400