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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Preferred stock, par value (in dollars per share) $ 0.0001us-gaap_PreferredStockParOrStatedValuePerShare $ 0.0001us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized 17,490,000us-gaap_PreferredStockSharesAuthorized 17,490,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Convertible stock, par value (in dollars per share) $ 0.0001tier_ConvertibleStockParOrStatedValuePerShare $ 0.0001tier_ConvertibleStockParOrStatedValuePerShare
Convertible stock, shares authorized 1,000tier_ConvertibleStockSharesAuthorized 1,000tier_ConvertibleStockSharesAuthorized
Convertible stock, shares outstanding 0tier_ConvertibleStockSharesOutstanding 0tier_ConvertibleStockSharesOutstanding
Common stock, par value (in dollars per share) $ 0.0001us-gaap_CommonStockParOrStatedValuePerShare $ 0.0001us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 382,499,000us-gaap_CommonStockSharesAuthorized 382,499,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 299,406,078us-gaap_CommonStockSharesIssued 299,264,100us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 299,406,078us-gaap_CommonStockSharesOutstanding 299,264,100us-gaap_CommonStockSharesOutstanding