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Preferred Stock Warrant Liability (Details)
Dec. 31, 2013
$ / shares
shares
Class of Warrant or Right [Line Items]  
Warrant term 10 years
Financing Arrangement Warrant One | Series Seed  
Class of Warrant or Right [Line Items]  
Shares for purchase as a result of warrants issued (in shares) | shares 375,230
Exercise price (in dollars per share) | $ / shares $ 0.1066
Financing Arrangement Warrant One | Series A  
Class of Warrant or Right [Line Items]  
Shares for purchase as a result of warrants issued (in shares) | shares 66,265
Exercise price (in dollars per share) | $ / shares $ 0.22636
Financing Arrangement Warrant Two | Series A-1  
Class of Warrant or Right [Line Items]  
Shares for purchase as a result of warrants issued (in shares) | shares 624,730
Exercise price (in dollars per share) | $ / shares $ 0.2401
Financing Arrangement Warrant Two | Series B  
Class of Warrant or Right [Line Items]  
Shares for purchase as a result of warrants issued (in shares) | shares 308,315
Exercise price (in dollars per share) | $ / shares $ 0.486516