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Other Long-term Liabilities - Additional Information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
CHF (SFr)
Dec. 31, 2015
USD ($)
Jan. 31, 2014
USD ($)
Jul. 31, 2013
CHF (SFr)
May 31, 2013
USD ($)
Facility in Switzerland            
Schedule Of Other Long Term Liabilities [Line Items]            
Line of credit facility, maximum borrowing capacity | SFr         SFr 400,000  
Line of credit   SFr 220,000 $ 232      
Principal and interest payment, start date Jan. 01, 2014          
Principal and interest payment, end date Dec. 31, 2018          
Line of credit facility, Interest rate 5.00%          
Facility in the U.S.            
Schedule Of Other Long Term Liabilities [Line Items]            
Line of credit | $       $ 226   $ 226
Principal and interest payment, start date Jun. 01, 2013          
Principal and interest payment, end date May 01, 2023          
Line of credit facility, Interest rate 7.00%