Condensed Consolidated Statement Of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating Activities
Net loss	$ (16,780,000)	$ (8,616,000)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	3,593,000	3,653,000
Provision for losses on trade and installment receivables	176,000	47,000
Benefit for deferred income taxes	(728,000)	(29,000)
Provision for other deferred liabilities	283,000	79,000
Provision for stock-based compensation	838,000	2,089,000
Loss on disposals of property and equipment	9,000	19,000
Amortization of convertible debt discount	1,749,000	664,000
Amortization of debt fees	521,000	379,000
Gain on convertible debt derivatives	901,000	604,000
Changes in operating assets and liabilities:
Trade receivables	(6,386,000)	(6,938,000)
Installment sales contracts, net	(161,000)	(674,000)
Inventories	(8,603,000)	(9,480,000)
Other current assets	(1,714,000)	(2,495,000)
Accounts payable	4,028,000	(2,529,000)
Accrued expenses	(4,322,000)	(12,108,000)
Other long-term liabilities	(1,932,000)	(2,162,000)
Net Cash Used by Operating Activities	(30,330,000)	(38,705,000)
Investing Activities
Purchases of property and equipment	(3,034,000)	(1,464,000)
Proceeds from sale of property and equipment	10,000	4,000
Change in other long-term assets	19,000	(103,000)
Other	(3,000)	42,000
Net Cash Used by Investing Activities	(3,008,000)	(1,521,000)
Financing Activities
Proceeds from revolving lines of credit and long-term borrowings	0	122,025,000
Payments on revolving lines of credit and long-term borrowings	(14,027,000)	(546,000)
Proceeds from exercise of stock options	0	17,000
Payment of financing costs	0	(4,562,000)
Payment of dividends	(397,000)	(400,000)
Issuance of warrants	0	12,376,000
Purchase of treasury stock	0	(5,000,000)
Net Cash Provided (Used) by Financing Activities	(14,424,000)	123,910,000
Effect of exchange rate changes on cash	364,000	965,000
Increase (Decrease) in cash and cash equivalents	(47,398,000)	84,649,000
Cash and cash equivalents at beginning of year	124,234,000	60,055,000
Cash and cash equivalents at end of period	$ 76,836,000	$ 144,704,000