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 9 Months Ended
Nov. 11, 2015
Dec. 17, 2013
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Operating Leases, Rent Expense, Sublease Rentals     $ 500 $ 400 $ 1,600 $ 900
Operating Leases, Rent Expense, Net     1,400 $ 800 3,000 $ 2,300
Operating Leases, Future Sublease Income, Remainder of Fiscal Year     563   $ 563  
Lease Expiration Date         Dec. 31, 2023  
Operating Leases, Future Sublease Income, Due in Two Years     2,833   $ 2,833  
Operating Leases, Future Sublease Income, Due in Three Years     3,544   3,544  
Operating Leases, Future Sublease Income, Due in Four Years     4,026   4,026  
Operating Leases, Future Sublease Income, Due in Five Years     4,120   4,120  
Operating Leases, Future Sublease Income, Due Thereafter     1,231   1,231  
Operating Leases, Future Sublease Income Due     $ 16,317   $ 16,317  
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