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Short Term Investments - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 28, 2015
Dec. 31, 2014
Securities Purchased Under Agreements to Resell and Other Short Term Investment Securities [Line Items]    
Short-term investments $ 64,993us-gaap_ShortTermInvestments $ 64,995us-gaap_ShortTermInvestments
Weighted average interest rate on U.S. Treasury bills, maximum 1.00%faro_USTreasuryBillRateMaximum 1.00%faro_USTreasuryBillRateMaximum
US Treasury Bill Securities    
Securities Purchased Under Agreements to Resell and Other Short Term Investment Securities [Line Items]    
Short-term investments $ 64,993us-gaap_ShortTermInvestments
/ us-gaap_InvestmentTypeAxis
= us-gaap_USTreasuryBillSecuritiesMember		 $ 64,995us-gaap_ShortTermInvestments
/ us-gaap_InvestmentTypeAxis
= us-gaap_USTreasuryBillSecuritiesMember