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Redeemable Convertible Preferred Stock and Stockholders' Equity/(Deficit) (Tables)
 12 Months Ended
Dec. 31, 2017
Temporary Equity And Stockholder's Equity [Abstract]  
Temporary Equity
As of December 31, 2016, the Company had outstanding redeemable convertible preferred stock as follows:
 
As of December 31, 2016
 
Shares Authorized
 
Shares Issued and Outstanding
 
Aggregate Liquidation Preference
 
Proceeds, Net of Issuance Costs
 
 
 
 
 
 
 
 
Series A-1
4,378,284
 
1,459,427
 
$
500

 
$
462

Series A-2
109,552
 
36,517
 
11

 
11

Series A-3
9,099,610
 
3,033,202
 
259

 
241

Series B
36,338,577
 
12,112,853
 
7,998

 
7,952

Series C
33,388,982
 
11,129,656
 
12,000

 
11,950

Series D
28,574,005
 
9,524,665
 
10,269

 
10,201

Series E
12,041,148
 
4,013,712
 
14,924

 
14,841

Series F
20,808,580
 
6,936,186
 
50,536

 
50,453

Series G
21,527,376
 
7,175,784
 
70,991

 
68,062

Total
166,266,114
 
55,422,002
 
$
167,488

 
$
164,173

The following table presents the accretion of the redeemable convertible preferred stock to its redemption value recorded within the consolidated statements of changes in redeemable convertible preferred stock and stockholders’ deficit during the periods presented:

 
Year End December 31,
 
2015
 
2016
 
2017
 
 
 
 
 
 
Series A-1
$
(2,674
)
 
$
(1,618
)
 
$
(4,904
)
Series A-2
(67
)
 
(40
)
 
(123
)
Series A-3
(5,650
)
 
(3,360
)
 
(10,192
)
Series B
(22,561
)
 
(13,416
)
 
(40,336
)
Series C
(20,390
)
 
(12,333
)
 
(37,062
)
Series D
(17,450
)
 
(10,555
)
 
(31,717
)
Series E
(7,353
)
 
(4,086
)
 
(12,884
)
Series F
(12,494
)
 
(6,025
)
 
(20,184
)
Series G
(13,585
)
 
(4,069
)
 
(18,513
)
Total
$
(102,224
)
 
$
(55,502
)
 
$
(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:

 
December 31,
 
2016
 
2017
 
 
 
 
Redeemable convertible preferred stock outstanding
55,422,002

 
—

Stock options issued and outstanding
13,291,684

 
13,180,950

Restricted stock units outstanding
—

 
981,276

Shares available for future equity grants
4,941,504

 
7,026,071

Total
73,655,190

 
21,188,297