Commitments and Contingencies Commitments and Contingencies - Operating Leases (Details) $ in Thousands	Dec. 31, 2017 USD ($) ft²
Other Commitments [Line Items]
Operating Leases, Future Minimum Payments Due, 2018	$ 1,202
Operating Leases, Future Minimum Payments, Due 2019	1,224
Operating Leases, Future Minimum Payments, Due 2020	1,120
Operating Leases, Future Minimum Payments, Due 2021	285
Operating Leases, Future Minimum Payments, Due 2022	0
Operating Leases, Future Minimum Payments, Due Thereafter	0
Operating Leases, Future Minimum Payments Due	$ 3,831
Aliso Viejo, California [Member]
Other Commitments [Line Items]
Lease agreements, area | ft²	18,700
Other Locations [Member]
Other Commitments [Line Items]
Lease agreements, area | ft²	18,000
Sublease [Member]
Other Commitments [Line Items]
Lease agreements, area | ft²	5,800