Condensed Consolidated Statement Of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating Activities
Net loss	$ (14,108,000)	$ (16,780,000)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	4,111,000	3,593,000
Provision for losses on trade and installment receivables	201,000	176,000
Benefit for deferred income taxes	(3,000)	(728,000)
Provision for other deferred liabilities	(66,000)	(283,000)
Provision for equity compensation	1,766,000	838,000
Loss on disposals of property and equipment	35,000	9,000
Amortization of convertible debt discount	2,786,000	1,749,000
Amortization of debt fees	620,000	521,000
Gain on convertible debt derivatives	103,000	901,000
Changes in operating assets and liabilities:
Trade receivables	(930,000)	(6,386,000)
Installment sales contracts, net	141,000	(161,000)
Inventories	(8,713,000)	(8,603,000)
Other current assets	(1,653,000)	(1,714,000)
Accounts payable	2,759,000	4,028,000
Accrued expenses	(11,509,000)	(4,322,000)
Other long-term liabilities	15,000	(1,932,000)
Net Cash Used by Operating Activities	(24,651,000)	(30,330,000)
Investing Activities
Purchases of property and equipment	(2,065,000)	(3,034,000)
Proceeds from sale of property and equipment	10,000	10,000
Change in other long-term assets	(227,000)	19,000
Other	(1,000)	(3,000)
Net Cash Used by Investing Activities	(2,283,000)	(3,008,000)
Financing Activities
Payments on revolving lines of credit and long-term borrowings	(393,000)	(14,027,000)
Proceeds from exercise of stock options	1,410,000	0
Payment of dividends	(403,000)	(397,000)
Issuance of warrants	12,376,000
Purchase of treasury stock	(920,000)	0
Net Cash Used by Financing Activities	(306,000)	(14,424,000)
Effect of exchange rate changes on cash	1,330,000	364,000
Increase in cash and cash equivalents	(25,910,000)	(47,398,000)
Cash and cash equivalents at beginning of year	176,528,000	124,234,000
Cash and cash equivalents at end of period	$ 150,618,000	$ 76,836,000