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BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Non-redeemable preferred stock, par value (in dollars per share) $ 0.0001    
Non-redeemable preferred stock, shares authorized (in shares) 10,000,000    
Non-redeemable preferred stock, shares issued (in shares) 0    
Non-redeemable preferred stock, shares outstanding (in shares) 0    
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001 $ 0.0001
Common stock, shares authorized (in shares) 200,000,000 30,782,380  
Common stock, shares issued (in shares) 35,513,987 131,644  
Common stock, shares outstanding (in shares) 35,513,987 131,644  
Series C      
Non-redeemable preferred stock, par value (in dollars per share) $ 0.00001 $ 0.00001 0.00001
Non-redeemable preferred stock, shares authorized (in shares) 0 16,100,000  
Non-redeemable preferred stock, shares issued (in shares) 0 11,239,359  
Non-redeemable preferred stock, shares outstanding (in shares) 0 11,239,359  
Liquidation value   $ 50,577  
Series B-2      
Non-redeemable preferred stock, par value (in dollars per share) $ 0.00001 $ 0.00001 0.00001
Non-redeemable preferred stock, shares authorized (in shares) 0 1,403,984  
Non-redeemable preferred stock, shares issued (in shares) 0 1,403,984  
Non-redeemable preferred stock, shares outstanding (in shares) 0 1,403,984  
Series B-1      
Non-redeemable preferred stock, par value (in dollars per share) $ 0.00001 $ 0.00001 0.00001
Non-redeemable preferred stock, shares authorized (in shares) 0 2,451,560  
Non-redeemable preferred stock, shares issued (in shares) 0 2,451,560  
Non-redeemable preferred stock, shares outstanding (in shares) 0 2,451,560  
Series A      
Non-redeemable preferred stock, par value (in dollars per share) $ 0.00001 $ 0.00001 $ 0.00001
Non-redeemable preferred stock, shares authorized (in shares) 0 11,381,640  
Non-redeemable preferred stock, shares issued (in shares) 0 11,381,640  
Non-redeemable preferred stock, shares outstanding (in shares) 0 11,381,640  
Scenario, Previously Reported      
Common stock, shares authorized (in shares)   62,000,000 62,000,000
Common stock, shares issued (in shares)   265,158 166,875
Common stock, shares outstanding (in shares)   265,158 166,875
Scenario, Previously Reported | Series C      
Non-redeemable preferred stock, shares authorized (in shares)   21,000,000 21,000,000
Non-redeemable preferred stock, shares issued (in shares)   14,660,096 14,464,445
Non-redeemable preferred stock, shares outstanding (in shares)   14,660,096 14,464,445
Scenario, Previously Reported | Series B-2      
Non-redeemable preferred stock, shares authorized (in shares)   2,827,844 2,827,844
Non-redeemable preferred stock, shares issued (in shares)   2,827,844 2,827,844
Non-redeemable preferred stock, shares outstanding (in shares)   2,827,844 2,827,844
Scenario, Previously Reported | Series B-1      
Non-redeemable preferred stock, shares authorized (in shares)   4,937,813 4,937,813
Non-redeemable preferred stock, shares issued (in shares)   4,937,813 4,937,813
Non-redeemable preferred stock, shares outstanding (in shares)   4,937,813 4,937,813
Scenario, Previously Reported | Series A      
Non-redeemable preferred stock, shares authorized (in shares)   22,924,209 22,924,209
Non-redeemable preferred stock, shares issued (in shares)   22,924,209 22,924,209
Non-redeemable preferred stock, shares outstanding (in shares)   22,924,209 22,924,209