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Leases - Minimum Lease Payments and Rent Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Minimum lease payments    
2018 (nine months remaining) $ 2,955  
2019 3,982  
2020 4,035  
2021 4,088  
2022 and beyond 25,676  
Total minimum lease payments 40,736  
Deferred rent related to lease incentives-current 1,086  
Deferred rent related to lease incentives 8,966  
Aggregate rent expense    
Rent expense 707 $ 1,026
Lexington    
Minimum lease payments    
2018 (nine months remaining) 1,396  
2019 1,903  
2020 1,956  
2021 2,009  
2022 and beyond 4,890  
Total minimum lease payments 12,154  
Deferred rent related to lease incentives-current 750  
Deferred rent related to lease incentives 4,637  
Aggregate rent expense    
Rent expense 278 278
Amsterdam    
Minimum lease payments    
2018 (nine months remaining) 1,559  
2019 2,079  
2020 2,079  
2021 2,079  
2022 and beyond 20,786  
Total minimum lease payments 28,582  
Deferred rent related to lease incentives-current 336  
Deferred rent related to lease incentives 4,329  
Aggregate rent expense    
Rent expense $ 429 $ 748