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Restricted cash	12 Months Ended
Restricted cash	Dec. 31, 2014
Cash And Cash Equivalents [Abstract]
Restricted cash	6. Restricted cash As of December 31, 2014 and 2013, the Company maintained letters of credit of $1.2 million and $1.4 million, respectively, which are required to be collateralized with a bank account at a financial institution in accordance with the Company’s current and former headquarters’ lease agreements.