Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Narrative (Details)

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Commitments and Contingencies - Narrative (Details)
12 Months Ended
Dec. 31, 2015
USD ($)
ft²
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Commitments and Contingencies (Textual) [Abstract]      
Lease area space occupancy (in square feet) | ft² 107,200    
Incentive from Lessor $ 1,700,000 $ 2,200,000  
Asset retirement obligations 400,000 400,000  
Accretion of asset retirement obligation   0 $ 0
Letters of credit 700,000 700,000  
Remaining minimum lease payments 11,295,000    
Rent expense 3,400,000 3,400,000 3,600,000
Sublease income 600,000 400,000 $ 0
Total future minimum sublease rentals to be received under noncancellable subleases 2,700,000    
Non-current portion of lease incentive obligation      
Commitments and Contingencies (Textual) [Abstract]      
Incentive from Lessor $ 1,300,000 $ 1,700,000