Condensed Consolidated Statement Of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating Activities
Net loss	$ (26,603,000)	$ (30,651,000)
Adjustments to reconcile net loss to net cash used by operating activities:
Depreciation and amortization	7,809,000	7,700,000
Operating Lease, Right-of-Use, Amortization	4,655,000	0
Provision for losses on trade and installment receivables	482,000	716,000
Provision (benefit) for deferred income taxes	36,000	(128,000)
Provision for other deferred liabilities	471,000	(7,000)
Provision for equity compensation	4,303,000	2,943,000
Loss on disposals of property and equipment	124,000	21,000
Amortization of convertible debt discount	6,665,000	5,650,000
Amortization of debt fees	1,225,000	1,246,000
Gain on convertible debt derivatives	1,197,000	124,000
Changes in operating assets and liabilities:
Trade receivables	(1,087,000)	(1,659,000)
Installment sales contracts, net	353,000	294,000
Inventories	3,772,000	(17,079,000)
Other current assets	(2,246,000)	(1,076,000)
Accounts payable	(5,891,000)	3,231,000
Accrued expenses	(12,208,000)	(18,289,000)
Other long-term liabilities	(516,000)	114,000
Net Cash Used by Operating Activities	(19,853,000)	(47,098,000)
Investing Activities
Purchases of property and equipment	(4,321,000)	(4,227,000)
Proceeds from sale of property and equipment	64,000	37,000
Change in other long-term assets	(40,000)	(287,000)
Net Cash Used by Investing Activities	(4,297,000)	(4,477,000)
Financing Activities
Payments on revolving lines of credit, long-term borrowings and capital leases	(1,747,000)	(602,000)
Proceeds from exercise of stock options	0	2,618,000
Payment of dividends	(819,000)	(808,000)
Purchase of treasury stock	(860,000)	(2,404,000)
Net Cash Used by Financing Activities	(3,426,000)	(1,196,000)
Effect of exchange rate changes on cash	180,000	(1,359,000)
Decrease in cash and cash equivalents	(27,396,000)	(54,130,000)
Cash and cash equivalents at beginning of year	116,907,000	176,528,000
Cash and cash equivalents at end of period	$ 89,511,000	$ 122,398,000