Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Additional Information (Details)

v3.8.0.1
Commitments and Contingencies - Additional Information (Details)
$ in Millions
1 Months Ended 12 Months Ended
Jun. 30, 2016
Aug. 31, 2015
ft²
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Loss Contingencies [Line Items]        
Area of leased property | ft²   3,950    
Rent expenses recognized | $     $ 0.5 $ 0.5
Freising, Germany        
Loss Contingencies [Line Items]        
Lease term 1 year      
Lease extension term 1 year