Fair Value Measurements (Financial Assets and Liabilities) (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Restricted cash balance	$ 0	$ 1,451,000
Liabilities:
Contingent earn-out	1,800,000	0
Recurring
Assets:
Assets	2,828,000	2,871,000
Liabilities:
Liabilities	1,800,000	2,000
Recurring | Money market funds
Assets:
Money market funds	2,828,000	2,806,000
Recurring | Foreign currency derivative contracts
Assets:
Foreign currency derivative contracts	0	65,000
Liabilities:
Foreign currency derivative contracts	0	2,000
Recurring | Contingent earn-out
Liabilities:
Contingent earn-out	1,800,000	0
Recurring | Level 1
Assets:
Assets	2,828,000	2,806,000
Liabilities:
Liabilities	0	0
Recurring | Level 1 | Money market funds
Assets:
Money market funds	2,828,000	2,806,000
Recurring | Level 1 | Foreign currency derivative contracts
Assets:
Foreign currency derivative contracts	0	0
Liabilities:
Foreign currency derivative contracts	0	0
Recurring | Level 1 | Contingent earn-out
Liabilities:
Contingent earn-out	0	0
Recurring | Level 2
Assets:
Assets	0	65,000
Liabilities:
Liabilities	0	2,000
Recurring | Level 2 | Money market funds
Assets:
Money market funds	0	0
Recurring | Level 2 | Foreign currency derivative contracts
Assets:
Foreign currency derivative contracts	0	65,000
Liabilities:
Foreign currency derivative contracts	0	2,000
Recurring | Level 2 | Contingent earn-out
Liabilities:
Contingent earn-out	0	0
Recurring | Level 3
Assets:
Assets	0	0
Liabilities:
Liabilities	1,800,000	0
Recurring | Level 3 | Money market funds
Assets:
Money market funds	0	0
Recurring | Level 3 | Foreign currency derivative contracts
Assets:
Foreign currency derivative contracts	0	0
Liabilities:
Foreign currency derivative contracts	0	0
Recurring | Level 3 | Contingent earn-out
Liabilities:
Contingent earn-out	$ 1,800,000	$ 0