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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Apr. 01, 2016
Apr. 03, 2015
Cash flows from operating activities:    
Net loss $ (8,041) $ (2,340)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation of property and equipment 591 497
Amortization of long-lived intangibles 54 52
Deferred income taxes (1,639) (118)
Change in net pension liability 118 50
Stock-based compensation expense 7,458 994
Accretion of asset retirement obligation 0 1
Provision for sales return and bad debt expense (22) 99
Changes in working capital:    
Accounts receivable trade, net (317) (56)
Inventories 564 617
Prepayments, deposits and other current assets (912) (573)
Accounts payable (435) (1,741)
Other current liabilities (398) 309
Net cash used in operating activities (2,979) (2,209)
Cash flows from investing activities:    
Acquisition of property and equipment (1,006) (328)
Sale of property and equipment 0 2
Net cash used in investing activities (1,006) (326)
Cash flows from financing activities:    
Repayment of capital lease obligations (92) (115)
Repurchase of employee common stock for taxes withheld (611) 0
Proceeds from vested restricted stock and exercise of stock options 7 421
Net cash provided by (used in) financing activities (696) 306
Effect of exchange rate changes on cash and cash equivalents 247 25
Decrease in cash and cash equivalents (4,434) (2,204)
Cash and cash equivalents, at beginning of the period 13,402 13,013
Cash and cash equivalents, at end of the period $ 8,968 $ 10,809