XML 71 R55.htm IDEA: XBRL DOCUMENT v3.6.0.2
Commitments and Contingencies - Rent Expense and Lease Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Lease Commitments      
Rent expense, including real estate taxes $ 1.9 $ 1.7 $ 1.7
Cash restricted for a security deposit $ 0.3 $ 0.3  
Cambridge Facility      
Lease Commitments      
Renewal option period exercisable by the Company 5 years    
Cambridge Facility | Maximum      
Lease Commitments      
Premises improvements $ 0.3    
Exton Facility      
Lease Commitments      
Renewal option period exercisable by the Company 3 years