Organization and Summary of Significant Accounting Policies Fair Value Measurement 2 (Details) - 12 months ended Dec. 31, 2017 $ in Thousands, AUD in Millions	USD ($)	AUD
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Contingent consideration liability, current	$ 653
Contingent consideration liability, noncurrent	1,171
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	1,000	AUD 0.5
Note receivable fair value adjustment	(1,200)
The Melton Corporation [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Contingent consideration paid	$ 200