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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash flows from operating activities:    
Net loss $ (2,786) $ 1,151
Adjustments to reconcile net (loss) income to net cash used in operating activities:    
Depreciation expense 608 647
Warranty expense (6)  
Change in the value of contingent consideration (70) 14
Provision for losses on uncollectible accounts receivable 442 325
Amortization of intangible assets 39 33
Impairment of intangible assets 100  
Impairment of goodwill 39  
Amortization of financing fees 38 37
Issuance of common stock for services   20
Provision for obsolete inventory 293 228
Deferred rent 1,033 (222)
Employee stock-based compensation expense 98 150
Deferred tax expense   (50)
Gain on asset disposal (6)  
Changes in operating assets and liabilities, net of business acquisition (in 2012):    
Accounts receivable 2,959 (1,593)
Inventory (265) (2,291)
Prepaid expenses 65 83
Deposit and other current assets (2,057) 41
Accounts payable 232 264
Accrued liabilities (1,048) 222
Income taxes payable (384) (259)
Net cash used in operating activities (676) (1,200)
Cash flows from investing activities:    
Purchases of equipment (501) (388)
Change in inventory used for rental 550 (794)
Payments on contingent consideration (3)  
Cash paid for domain name   (18)
Cash paid for acquisition   (245)
Net cash provided by (used in) investing activities 46 (1,445)
Cash flows from financing activities:    
Net borrowings from line of credit 385 2,788
Issuance of common stock   10
Deferred financing fees   (2)
Payments on notes payable and capital lease obligations (110) (97)
Net cash provided by financing activities 275 2,699
Net (decrease) increase in cash (355) 54
Cash at beginning of period 823 789
Cash at end of period 468 843
Supplemental cash flow information:    
Interest paid 449 259
Income taxes paid, net of tax refunds (including interest and penalties) 384 1,016
Supplemental disclosure of non-cash investing and financing activities:    
Common stock issuances for business acquisition   158
Increase in contingent consideration for business acquisition   135
Equipment acquired through capital lease $ 137