Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Net Investment in Sales-type Leases (Schedule of Company's Net Investment in Sales-type Leases) (Details)

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Net Investment in Sales-type Leases (Schedule of Company's Net Investment in Sales-type Leases) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Leases, Capital [Abstract]    
Future minimum lease payments receivable $ 13,748 $ 25,910
Less allowance for doubtful accounts (1,575) (844)
Net future minimum lease payment receivable 12,173 25,066
Less unearned interest income (526) (1,223)
Net investment in sales-type leases $ 11,647 $ 23,843