Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Narrative (Details)

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Summary of Significant Accounting Policies - Narrative (Details)
$ in Thousands, ¥ in Millions
Sep. 30, 2015
USD ($)
Sep. 30, 2015
CNY (¥)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Dec. 31, 2013
USD ($)
Cash and Cash Equivalents [Line Items]          
Cash and cash equivalents $ 94,565   $ 44,816 $ 39,748 $ 14,550
Bank Deposit in Anticipation of Submitting Direct Selling License Application          
Cash and Cash Equivalents [Line Items]          
Restricted cash and cash equivalents 3,100 ¥ 20      
CHINA          
Cash and Cash Equivalents [Line Items]          
Cash and cash equivalents $ 3,500