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Redeemable Convertible Preferred Stock and Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2018
Temporary Equity And Stockholder's Equity [Abstract]  
Temporary Equity
The following table presents the accretion expense of the redeemable convertible preferred stock to its redemption value recorded within the consolidated statements of changes in redeemable convertible preferred stock and stockholders’ equity during the three and nine months ended September 30, 2017:
 
Three Months Ended September 30, 2017
 
Nine Months Ended September 30, 2017
Series A-1
$
(1,119
)
 
$
(4,904
)
Series A-2
(28
)
 
(123
)
Series A-3
(2,349
)
 
(10,192
)
Series B
(9,284
)
 
(40,336
)
Series C
(8,530
)
 
(37,062
)
Series D
(7,300
)
 
(31,717
)
Series E
(2,948
)
 
(12,884
)
Series F
(4,541
)
 
(20,184
)
Series G
(4,125
)
 
(18,513
)
Total
$
(40,224
)
 
$
(175,915
)
Schedule of Reserved Shares of Common Stock
The Company has reserved shares of common stock, on an as-converted basis, for future issuance as follows:
 
September 30, 2018
 
December 31, 2017
Equity Incentive Plans:
 
 
 
Stock options issued and outstanding
10,150,522

 
13,180,950

Restricted stock units outstanding
2,081,173

 
981,276

Shares available for future equity grants
6,214,739

 
7,026,071

Total
18,446,434

 
21,188,297

 
 
 
 
2017 Employee Stock Purchase Plan:
 
 
 
Shares issued under employee stock purchase plan
187,076

 
—

Shares available for future purchases under employee stock purchase plan
2,227,612

 
1,600,000

Total
2,414,688

 
1,600,000