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Redeemable Convertible Preferred Stock and Stockholders' Equity/(Deficit) (Tables)
 9 Months Ended
Sep. 30, 2017
Temporary Equity And Stockholder's Equity [Abstract]  
Temporary Equity

The following table presents the accretion income/(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/(deficit) during the periods presented:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2016
 
2017
 
2016
 
2017
 
 
 
 
 
 
 
 
Series A-1
$
(88
)
 
$
(1,119
)
 
$
1,448

 
$
(4,904
)
Series A-2
(2
)
 
(28
)
 
36

 
(123
)
Series A-3
(182
)
 
(2,349
)
 
3,010

 
(10,192
)
Series B
(1,090
)
 
(9,284
)
 
12,021

 
(40,336
)
Series C
(668
)
 
(8,530
)
 
11,039

 
(37,062
)
Series D
(571
)
 
(7,300
)
 
9,447

 
(31,717
)
Series E
(241
)
 
(2,948
)
 
4,102

 
(12,884
)
Series F
(208
)
 
(4,541
)
 
7,084

 
(20,184
)
Series G
—

 
(4,125
)
 
8,632

 
(18,513
)
Total
$
(3,050
)
 
$
(40,224
)
 
$
56,819

 
$
(175,915
)
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
 
$
500,000

 
$
462,000

Series A-2
109,552
 
36,517
 
11,000

 
11,000

Series A-3
9,099,610
 
3,033,202
 
259,000

 
241,000

Series B
36,338,577
 
12,112,853
 
7,998,000

 
7,952,000

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

 
11,950,000

Series D
28,574,005
 
9,524,665
 
10,269,000

 
10,201,000

Series E
12,041,148
 
4,013,712
 
14,924,000

 
14,841,000

Series F
20,808,580
 
6,936,186
 
50,536,000

 
50,453,000

Series G
21,527,376
 
7,175,784
 
70,991,000

 
68,062,000

Total
166,266,114
 
55,422,002
 
$
167,488,000

 
$
164,173,000
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,
 
September 30,
 
2016
 
2017
Redeemable convertible preferred stock outstanding
55,422,002

 
—

Stock options issued and outstanding
13,291,684

 
13,298,339

Shares available for future equity grants
4,941,504

 
7,974,192

Total
73,655,190

 
21,272,531