Annual report pursuant to Section 13 and 15(d)

Corporate Information - Narrative (Details)

v3.19.1
Corporate Information - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2018
May 31, 2013
Subsequent Event [Line Items]    
Cash, cash equivalents and investments $ 128.1  
Pieris Pharmaceuticals GmbH    
Subsequent Event [Line Items]    
Proportion of voting interests acquired (as a percent)   100.00%