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Prepaid Expenses and Other Current Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Prepaid Expenses And Other Current Assets [Line Items]    
Equipment maintenance and services $ 689 $ 492
Prepaid VAT 558 419
Prepaid insurance 455 359
Vendor credit   486
Deferred costs 206 5
Prepaid taxes 105 220
Interest receivable 63 100
Other 22 23
Total $ 2,098 $ 2,104