Condensed Consolidated Statement Of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Activities
Net loss	$ (13,886,000)	$ (14,108,000)
Adjustments to reconcile net loss to net cash used by operating activities:
Depreciation and amortization	3,898,000	4,111,000
Operating Lease, Right-of-Use, Amortization	2,172,000	0
Provision for losses on trade and installment receivables	185,000	201,000
Provision (benefit) for deferred income taxes	329,000	(3,000)
Provision for other deferred liabilities	234,000	(66,000)
Provision for equity compensation	1,430,000	1,766,000
Loss on disposals of property and equipment	54,000	35,000
Amortization of convertible debt discount	3,099,000	2,786,000
Amortization of debt fees	615,000	620,000
Loss (Gain) on convertible debt derivatives	(273,000)	103,000
Changes in operating assets and liabilities:
Trade receivables	3,535,000	(930,000)
Installment sales contracts, net	13,000	141,000
Inventories	(1,588,000)	(8,713,000)
Other current assets	(3,957,000)	(1,653,000)
Accounts payable	(4,683,000)	2,759,000
Accrued expenses	(12,794,000)	(11,509,000)
Other long-term liabilities	(1,517,000)	15,000
Net Cash Used by Operating Activities	(22,588,000)	(24,651,000)
Investing Activities
Purchases of property and equipment	(1,812,000)	(2,065,000)
Proceeds from sale of property and equipment	20,000	10,000
Change in other long-term assets	(20,000)	(228,000)
Net Cash Used by Investing Activities	(1,812,000)	(2,283,000)
Financing Activities
Payments on revolving lines of credit, long-term borrowings and capital leases	(866,000)	(393,000)
Proceeds from exercise of stock options	0	1,410,000
Payment of dividends	(408,000)	(403,000)
Purchase of treasury stock	(381,000)	(920,000)
Net Cash Used by Financing Activities	(1,655,000)	(306,000)
Effect of exchange rate changes on cash	1,074,000	1,330,000
Decrease in cash and cash equivalents	(24,981,000)	(25,910,000)
Cash and cash equivalents at beginning of year	116,907,000	176,528,000
Cash and cash equivalents at end of period	$ 91,926,000	$ 150,618,000