Commitments and Contingencies (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Commitment And Contingencies [Line Items]
Remaining minimum distribution payments	$ 3.8
Maximum [Member]
Commitment And Contingencies [Line Items]
Purchase commitment, remaining minimum amount payment date	May 26, 2020
California office lease one
Commitment And Contingencies [Line Items]
Lease expiration period	2020-01
California office lease two
Commitment And Contingencies [Line Items]
Lease expiration period	2021-04
Illinois office lease
Commitment And Contingencies [Line Items]
Lease expiration period	2023-06
Arizona office lease
Commitment And Contingencies [Line Items]
Lease expiration period	2019-08
Automobile lease
Commitment And Contingencies [Line Items]
Lease expiration period	2020-05
Netherlands warehouse lease
Commitment And Contingencies [Line Items]
Lease expiration period	2019-08