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Short-term Investments (Tables)
9 Months Ended
Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]  
Schedule of Short-term Investments
Amortized cost represents the fair value at the date of acquisition as determined by the publicly traded quoted market price per share less a discount for lack of marketability, which is updated at each reporting date based on remaining contracted lock-up period, expected volatility of the stock over the term of the remaining trading restrictions, and assumed lack of dividends, and any other than temporary impairment recognized.
 
September 30, 2015
 
Amortized
Cost
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
Equity securities, available for sale
$
5,129

 
$

 
$
5,129