Annual report pursuant to Section 13 and 15(d)

Income Tax - Reconciliation of Income Tax Attributable to Operations (Detail)

v3.3.1.900
Income Tax - Reconciliation of Income Tax Attributable to Operations (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Income taxes at statutory rates (at a rate of 34% for all periods presented) $ (5,712) $ (8,922) $ (10,829)
Expenses not deducted for tax purposes (14) (452) (738)
Effect of tax rate changes on deferred tax assets and liabilities (13) (9) (744)
Rate differential on foreign earnings 689 1,445 2,003
Reduction (increase) in benefit of operating losses (32) 441 (10)
Investment tax credits (297) (357) (347)
Change in valuation allowance 5,114 7,854 10,538
Book to tax return adjustments 265   127
Income tax expense $ 0 $ 0 $ 0