Commitments and Contingencies - Narrative (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Jul. 31, 2005 USD ($) extension	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Sale Leaseback Transaction [Abstract]
Rent expense			$ 85	$ 173
Operating Leases, Rent Expense, Net [Abstract]
Operating leases, rent expense		$ 1,000
Office building
Operating Leases, Rent Expense, Net [Abstract]
Lease term of assets subject to operating leases		9 years
Vehicles
Operating Leases, Rent Expense, Net [Abstract]
Operating leases, rent expense		$ 1,500	$ 2,300	2,900
Other facilities | Minimum
Operating Leases, Rent Expense, Net [Abstract]
Lease term of assets subject to operating leases		1 year
Other facilities | Maximum
Operating Leases, Rent Expense, Net [Abstract]
Lease term of assets subject to operating leases		5 years
Office building
Sale Leaseback Transaction [Abstract]
Proceeds from the sale-leaseback transaction	$ 2,100
Sale-leaseback term	10 years
Deferred gain on sale-leaseback transaction	$ 562
Gain recognized on sale-lease back transaction		$ 8		$ 56
Options to extend term of the lease for additional five years | extension	2
Maximum extension term of each option to extend	5 years