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BALANCE SHEETS (Parenthetical) - $ / shares
Dec. 31, 2015
Dec. 31, 2014
Redeemable convertible preferred stock, shares authorized   22,004,436
Redeemable convertible preferred stock, shares issued   18,703,071
Redeemable convertible preferred stock, shares outstanding 0 18,703,071
Preferred stock, par value $ 0.00001 $ 0.00001
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.00001 $ 0.00001
Common stock, shares authorized 75,000,000 28,572,789
Common stock, shares issued 36,033,209 996,520
Common stock, shares outstanding 36,033,209 996,520
Redeemable Convertible Preferred Stock    
Redeemable convertible preferred stock, par value $ 0.00001 $ 0.00001
Redeemable convertible preferred stock, shares authorized 0 21,759,654
Redeemable convertible preferred stock, shares issued 0 18,458,289
Redeemable convertible preferred stock, shares outstanding 0 18,458,289
Convertible Preferred Stock    
Redeemable convertible preferred stock, par value $ 0.00001 $ 0.00001
Redeemable convertible preferred stock, shares authorized 0 244,782
Redeemable convertible preferred stock, shares issued 0 244,782
Redeemable convertible preferred stock, shares outstanding 0 244,782