Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income (loss)	$ 8,780	$ (5,845)	$ (2,361)
(Loss) income from discontinued operations	(691)	(1,599)	3,546
Income (loss) from continuing operations	9,471	(4,246)	(5,907)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Loss on impairment	0	0	608
Depreciation	266	184	615
Stock-based compensation	813	532	201
Settlement of acquisition obligations	0	0	(892)
Provision for doubtful accounts receivable	39	2	(32)
Provision for slow-moving and obsolete inventory	1,464	194	146
Amortization of intangible assets	0	0	0
Amortization of discounts on long-term borrowings and acquisition related liabilities	0	2,815	443
Amortization of loan origination fees	40	140	159
Change in estimate of contingent liabilities	0	0	12
Loss (gain) on dispositions of property and equipment	3	2	6
Change in operating assets and liabilities:
Accounts receivable, inventories, and other assets	(9,674)	(4,781)	(73)
Accounts payable and accrued liabilities	2,064	4,933	(849)
Deferred revenue	(40)	62	(680)
Total adjustments	(5,025)	4,083	(336)
Net cash provided by (used in) operating activities	4,446	(163)	(6,243)
Cash flows from investing activities:
Acquisitions of property and equipment	(2,242)	(194)	(174)
Proceeds from the sale of property and equipment	0	130	0
Net cash used in investing activities	(2,242)	(64)	(174)
Cash flows from financing activities:
Proceeds from warrants exercised	2,503	0	0
Proceeds from issuances of common stock, net	23,574	5,952	0
Proceeds from exercise of stock options and purchases through employee stock purchase plan	346	58	48
Proceeds from other borrowings	0	0	6,124
Payments on other borrowings	(13)	(223)	(304)
Net (repayments) proceeds from credit line borrowings	(453)	453	(1,590)
Net cash provided by financing activities	25,957	6,240	4,278
Net cash provided by (used in) continuing operations	28,161	6,013	(2,139)
Cash flows of discontinued operations:
Operating cash flows, net	(691)	(604)	3,279
Investing cash flows, net	181	0	(38)
Financing cash flows, net	(446)	136	0
Net cash used in discontinued operations	(956)	(468)	3,241
Net increase in cash and cash equivalents	27,205	5,545	1,102
Cash and cash equivalents, beginning of year	7,435	1,890	788
Cash and cash equivalents, end of year	34,640	7,435	1,890
Classification of cash and cash equivalents:
Cash and cash equivalents, end of year	7,435	1,890	788
Supplemental information:
Cash paid in year for interest	84	305	482
Cash paid in year for income taxes	200	0	0
Non-cash investing and financing activities:
Fully depreciated assets disposed of	106	1,238	2,623
Non-cash charge to write-off of remaining unamortized discount on convertible debt	0	2,287	204
Conversion of subordinated convertible debt	$ 0	$ 6,145	$ 1,500