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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash flows from operating activities:    
Net loss $ (9,409) $ (9,082)
Loss from discontinued operations 0 (12)
Loss from continuing operations (9,409) (9,070)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 514 555
Stock-based compensation 625 1,076
Stock-based compensation reversal (270) 0
Provision for doubtful accounts receivable 19 9
Provision for slow-moving and obsolete inventories and valuation reserves (644) (292)
Provision for warranties 152 110
Loss on dispositions of property and equipment 108 35
Changes in operating assets and liabilities:    
Accounts Receivable 2,638 5,027
Inventories 3,334 (5,993)
Prepaid and other assets (161) (308)
Accounts payable (1,173) (3,945)
Accrued and other liabilities (433) (761)
Deferred revenue 16 (93)
Total adjustments 4,725 (4,580)
Net cash used in operating activities (4,684) (13,650)
Cash flows from investing activities:    
Acquisitions of property and equipment (154) (1,475)
Proceeds from the sale of property and equipment 97 2
Net cash used in investing activities (57) (1,473)
Cash flows from financing activities:    
Proceeds from exercises of stock options and employee stock purchase plan purchases 105 386
Common stock withheld in lieu of income tax withholding on vesting of restricted stock units 49 0
Common stock withheld to satisfy exercise price and income tax withholding on option exercises 0 (309)
Net cash provided by financing activities 56 77
Effect of exchange rate changes on cash (9) 5
Net cash used in continuing operations (4,694) (15,041)
Cash flows of discontinued operations:    
Operating cash flows, net 0 (12)
Net cash used in discontinued operations 0 (12)
Net decrease in cash and cash equivalents (4,694) (15,053)
Cash and cash equivalents, beginning of period 16,629 34,640
Cash and cash equivalents, end of period 11,935 19,587
Classification of cash and cash equivalents:    
Cash and cash equivalents 11,593 19,245
Restricted cash held 342 342
Cash and cash equivalents, end of period $ 16,629 $ 34,640