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Unaudited Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 28, 2015
Jun. 29, 2014
OPERATING ACTIVITIES:    
Net loss $ (1,904) $ (1,711)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 1,759 1,717
Amortization of debt issuance costs and accretion of debt discount 222 261
Accretion and amortization of discounts and premiums on short-term investments 204 162
Share-based compensation 119 143
(Gain) loss on disposal of property and equipment (2) 24
Gain on sale of cost method investment (750) (1,000)
Impairments and other losses 682  
Changes in operating assets and liabilities:    
Other current assets (1,232) (496)
Income taxes receivable 62  
Accrued taxes, other than income taxes (82) 114
Deposits 195 210
Accounts payable and accrued expenses (474) 727
Net cash provided by (used in) operating activities (1,526) 1,151
INVESTING ACTIVITIES:    
Purchase of short-term investments (25,137) (52,390)
Sales and maturities of short-term investments 30,960 55,729
Purchase of property and equipment (1,552) (3,536)
Proceeds from disposal of property and equipment 4,409 17
Proceeds from sale of cost method investment 750  
Changes in other assets 20 23
Net cash provided by (used in) investing activities 9,450 (157)
FINANCING ACTIVITIES:    
Repayments of borrowings (897) (860)
Proceeds from issuance of common stock 16 133
Net cash used in financing activities (881) (727)
Net increase in cash and cash equivalents 7,043 267
Cash and cash equivalents - beginning of period 35,416 37,897
Cash and cash equivalents - end of period 42,459 38,164
Cash paid during the period for:    
Interest 315 361
Income taxes 110  
Noncash investing activities:    
Capital expenditures in accounts payable and accrued expenses $ 25 $ 1,216