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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net (loss) income $ (1,989) $ 1,129
Loss from discontinued operations (12) (95)
(Loss) income from continuing operations (1,977) 1,224
Adjustments to reconcile net (loss) income to net cash used in operating activities:    
Depreciation 151 49
Stock-based compensation 256 112
Provision for doubtful accounts receivable (27) 99
Provision for slow-moving and obsolete inventory (96) 386
Amortization of loan origination fees 0 11
Gain on dispositions of property and equipment 0 (1)
Changes in operating assets and liabilities:    
Accounts Receivable 4,104 (269)
Inventories (3,708) (3,935)
Prepaid and other assets (283) (57)
Accounts payable (1,373) (634)
Accrued and other liabilities (1,219) 571
Deferred revenue (26) 103
Total adjustments (2,221) (3,565)
Net cash used in operating activities (4,198) (2,341)
Cash flows from investing activities:    
Acquisitions of property and equipment (311) (112)
Net cash used in investing activities (311) (112)
Cash flows from financing activities:    
Proceeds from warrants exercised 0 2,494
Proceeds from exercises of stock options and employee stock purchase plan purchases 14 2
Net proceeds on credit line borrowings 0 1,273
Net cash provided by financing activities 14 3,769
Effect of exchange rate changes on cash 7 0
Net cash (used in) provided by continuing operations (4,488) 1,316
Cash flows of discontinued operations:    
Operating cash flows, net (12) (269)
Net cash used in discontinued operations (12) (269)
Net (decrease) increase in cash and cash equivalents (4,500) 1,047
Cash and cash equivalents, beginning of period 34,640 7,435
Cash and cash equivalents, end of period 30,140 8,482
Classification of cash and cash equivalents:    
Cash and cash equivalents 29,798 8,085
Restricted cash held 342 97
Cash and cash equivalents $ 34,640 $ 7,435