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Warrants (Tables)
9 Months Ended
Sep. 30, 2018
Other Liabilities Disclosure [Abstract]  
Schedule of Warrants Issued and Outstanding
Warrants issued and outstanding at both September 30, 2018 and December 31, 2017 are as follows (in thousands, except share and per share data):
 
 
Series
 
Date
 
Number of
Shares
Underlying
Warrants
 
Price per
Share
 
Fair Value
at the Date
of Issuance
Warrants to purchase
 
 
Issuance
 
Expiration
 
 
Common stock
 
 
 
7/19/2013
 
7/22/2023
[a]
101,010
 
$
3.96

 
$
244

Common stock
 
 
 
11/26/2014
 
11/26/2024
[a]
21,928
 
$
3.42

 
$
47

Common stock
 
 
 
3/1/2017
 
3/1/2027
[a]
1,388
 
$
5.94

 
$
5

Total common stock warrants
 
 
 
 
 
 
 
124,326
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Redeemable convertible preferred stock
 
Series 5
 
7/1/2012
 
7/25/2019
[b]
54,917
 
$
9.10

 
$
255

Redeemable convertible preferred stock
 
Series 5
 
7/19/2013
 
7/22/2023
[c]
21,989
 
$
9.10

 
$
122

Redeemable convertible preferred stock
 
Series 6
 
11/26/2014
 
11/26/2024
[c]
6,310
 
$
16.47

 
$
49

Redeemable convertible preferred stock
 
Series 6
 
10/20/2015
 
10/20/2025
[c]
39,339
 
$
16.47

 
$
396

Redeemable convertible preferred stock
 
Series 6
 
11/9/2015
 
11/9/2025
[c]
24,283
 
$
16.47

 
$
244

Redeemable convertible preferred stock
 
Series 7
 
12/22/2016
 
12/22/2026
[c]
9,712
 
$
10.03

 
$
45

Total redeemable convertible preferred stock warrants
 
 
 
 
 
 
 
156,550
 
 
 
 
Total outstanding common and redeemable convertible preferred stock warrants
 
 
 
 
 
 
 
280,876
 
 
 
 
 
[a]
Common stock warrants will remain outstanding until exercised by the holder.
[b]
These warrants will be net exercised immediately upon the closing of the Company’s IPO, or upon a corporate transaction as defined in the Note and Warrant Purchase Agreement dated July 25, 2012.
[c]
Convertible preferred stock warrants will remain outstanding until exercised by the holder and will convert to common stock warrants upon an IPO. The warrants will be exercisable for 10 years from the date of issuance.
Schedule of Weighted-Average Assumptions Used In Computation of Fair Value of Warrants
Weighted-average assumptions used in computation of the fair value of the redeemable convertible preferred stock warrants are summarized in the table below:
 
 
September 30,
 
December 31,
 
 
2018
 
2017
 
 
 
 
 
Remaining contractual term (in years)
 
4.7

 
5.3

Expected volatility
 
52.66
%
 
59.06
%
Risk-free interest rate
 
2.67
%
 
2.16
%
Dividend yield
 
%
 
%