Commitments and Contingencies Commitments and Contingencies - Operating Leases (Details) $ in Thousands	Dec. 31, 2018 USD ($) ft²
Other Commitments [Line Items]
Operating Leases, Future Minimum Payments Due, 2019	$ 1,739
Operating Leases, Future Minimum Payments, Due 2020	1,266
Operating Leases, Future Minimum Payments, Due 2021	322
Operating Leases, Future Minimum Payments, Due 2022	0
Operating Leases, Future Minimum Payments, Due 2023	0
Operating Leases, Future Minimum Payments, Due Thereafter	0
Operating Leases, Future Minimum Payments Due	$ 3,327
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	19,000
Sublease [Member]
Other Commitments [Line Items]
Lease agreements, area | ft²	5,800