Commitments and Contingencies - Leases (Details) (USD $)
0 Months Ended 12 Months Ended
Oct. 16, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Leases        
Rent expense   $ 1,377,000 $ 1,297,000 $ 1,961,000
Future commitments and obligations under operating lease        
2014   1,286,000    
2015   1,758,000    
2016   2,253,000    
2017   2,399,000    
2018   2,459,000    
Thereafter   17,557,000    
Total   27,712,000    
Lease term 139 months 0 days      
Monthly basic rent 196,000      
Annual lease increase 2.50%      
Free rent period 4 months 0 days      
Tenant improvement allowance 1,000,000.0      
Payment of tenant improvement allowance 10 months 0 days      
Payments made related to operating lease   $ 1,500,000