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Redeemable Convertible Preferred Stock and Stockholders' Equity (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2017:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2017
 
 
 
 
Series A-1
$
(3,085
)
 
$
(3,785
)
Series A-2
(77
)
 
(95
)
Series A-3
(6,478
)
 
(7,843
)
Series B
(25,601
)
 
(31,052
)
Series C
(23,523
)
 
(28,531
)
Series D
(20,131
)
 
(24,417
)
Series E
(8,130
)
 
(9,936
)
Series F
(12,522
)
 
(15,643
)
Series G
(11,374
)
 
(14,388
)
Total
$
(110,921
)
 
$
(135,690
)
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:
 
June 30, 2018
 
December 31, 2017
 
 
 
 
2017 Equity Incentive Plan:
 
 
 
Stock options issued and outstanding
10,775,812

 
13,180,950

Restricted stock units outstanding
2,010,186

 
981,276

Shares available for future equity grants
6,273,668

 
7,026,071

Total
19,059,666

 
21,188,297

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

 
0

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

 
1,600,000

Total
2,414,688

 
1,600,000