Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Leases (Details 2)

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Commitments and Contingencies - Leases (Details 2) - USD ($)
$ in Thousands
 3 Months Ended
Nov. 11, 2015
Dec. 17, 2013
Mar. 31, 2018
Mar. 31, 2017
Operating Leases, Rent Expense, Sublease Rentals     $ 700 $ 500
Operating Leases, Rent Expense, Net     1,200 $ 700
Operating Leases, Future Sublease Income, Remainder of Fiscal Year     $ 2,184  
Lease Expiration Date     Dec. 31, 2023  
Operating Leases, Future Sublease Income, Due in Two Years     $ 3,604  
Operating Leases, Future Sublease Income, Due in Three Years     4,088  
Operating Leases, Future Sublease Income, Due in Four Years     4,152  
Operating Leases, Future Sublease Income, Due in Five Years     879  
Operating Leases, Future Sublease Income, Due Thereafter     352  
Operating Leases, Future Sublease Income Due     $ 15,259  
The Campus Carlsbad, LLC [Member]        
Lessee Leasing Arrangements, Operating Leases, Term of Contract   3 years 7 months    
Northwest Mutual Life Insurance Company [Member]        
Lessee Leasing Arrangements, Operating Leases, Term of Contract 6 years 2 months