Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net loss	$ (5,283)	$ (23,474)
Adjustments to reconcile net loss to cash used in operating activities:
Depreciation and amortization	680	780
Stock-based compensation expense	421	1,631
Gain on sale of DuraFit business	(805)	0
Gain on change in fair value of liability-classified warrants	(523)	(1,554)
Gain on change in fair value of bifurcated derivative liability	0	(2,754)
Loss on extinguishment of debt	194	12,410
(Gain) Loss on foreign currency transactions	92	(965)
Amortization of debt discount	0	460
Impairment of goodwill	0	4,675
Other	187	150
Changes in operating assets and liabilities:
Accounts receivable	3,368	(1,124)
Inventories	2,056	965
Prepaid expenses and other assets	454	571
Accounts payable, accrued expenses and other current liabilities	(6,226)	1,894
Income taxes	52	(669)
Net cash used in operating activities	(5,333)	(7,004)
Cash flows from investing activities:
Purchases of property and equipment	(24)	(146)
Proceeds from sale of DuraFit business	3,337	0
Proceeds from sale of property, equipment and other assets	0	79
Net cash provided by (used in) investing activities	3,313	(67)
Cash flows from financing activities:
Net payments under demand line of credit	(1,458)	(2,055)
Payments of shareholder notes payable	(2,000)	0
Proceeds from issuance of common stock and warrants, net of offering costs	0	10,200
Proceeds from exercise of stock options	42	0
Proceeds from exercise of warrants	122	240
Proceeds from debt offerings	0	3,750
Net cash (used in) provided by financing activities	(3,294)	12,135
Effect of exchange rates on cash	282	(183)
Net change in cash	(5,032)	4,881
Cash at beginning of year	7,839	2,958
Cash at end of year	$ 2,807	$ 7,839