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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jul. 01, 2016
Cash flows from operating activities:    
Net loss $ (3,174) $ (10,184)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation of property, plant and equipment 1,548 1,237
Amortization of long-lived intangibles 110 111
Deferred income taxes 9 (1,802)
Change in net pension liability 30 220
Loss on disposal of property and equipment 72 17
Stock-based compensation expense 1,378 7,758
Provision for sales returns and bad debts 66 89
Inventory provision 789 1,182
Changes in working capital:    
Accounts receivable trade (21) (65)
Inventories 908 431
Prepayments, deposits and other current assets (278) (418)
Accounts payable (1,767) 1,280
Other current liabilities (961) (324)
Net cash used in operating activities (1,291) (468)
Cash flows from investing activities:    
Acquisition of property and equipment (696) (1,991)
Net cash used in investing activities (696) (1,991)
Cash flows from financing activities:    
Repayment of capital lease obligations (661) (184)
Proceeds from sale leaseback transactions 0 1,154
Repurchase of employee common stock for taxes withheld (234) (611)
Proceeds from vested restricted stock and exercise of stock options 1,963 737
Net cash provided by financing activities 1,068 1,096
Effect of exchange rate changes on cash, cash equivalents, and restricted cash 359 649
Decrease in cash, cash equivalents, and restricted cash (560) (714)
Cash, cash equivalents, and restricted cash, at beginning of the period 14,118 13,521
Cash, cash equivalents, and restricted cash, at end of the period $ 13,558 $ 12,807