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INCOME TAXES - Schedule of Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Jan. 01, 2017
Deferred tax assets:    
Net operating losses $ 37,631 $ 53,924
Capital losses 1,726 2,938
Accruals and reserves 1,487 1,875
Credits carryforward 5,743 5,080
Depreciation and amortization 9,056 14,415
Stock-based compensation 343 968
Deferred tax assets, gross 55,986 79,200
Valuation allowances (55,931) (79,150)
Deferred tax asset 55 50
Deferred tax liability $ 0 $ 0