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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2018
Stockholders' Equity Note [Abstract]  
Summary of the company's preferred stock and its terms
A summary of preferred stock and its terms as of December 31, 2017, is as follows:
Series
Shares
Authorized
Shares
Issued and
Outstanding
Carrying
Value
Liquidation
Preference
per Share
8%
Dividend
per Share
Conversion
Price per
Share
A5,375,507 5,375,507 $5,037 $1.00 $0.08 $6.65 
B8,706,909 8,706,909 15,913 1.84 0.15 9.91 
C14,091,589 13,829,906 14,949 1.07 0.09 7.12 
D5,683,292 5,683,292 6,043 1.07 0.09 7.12 
E15,373,091 15,267,175 39,848 2.62 0.21 15.16 
F27,664,232 27,372,261 37,316 1.37 0.11 9.11 
Total76,894,620 76,235,050 $119,106 
Summary of preferred stock warrants issued under the company's original credit facility and subsequent amendments
As of December 31, 2017, the following preferred stock warrants issued under our original credit facility and subsequent amendments were outstanding and exercisable:
IssuanceExpirationSeries
Exercise
Price
Warrants
Outstanding at
December 31, 2017
Initial
Value
Fair Value at
December 31, 2017
February 24, 2017February 24, 2027F$1.37 29,197 $$13 
August 7, 2015August 7, 2025E2.62 29,580 33 
June 27, 2014June 27, 2024E2.62 76,334 85 21 
August 5, 2013August 5, 2023C1.07 74,768 39 33 
November 16, 2012November 16, 2022C1.07 186,916 96 82 
Total396,795 $157 
As of May 7, 2018, the date of the closing of our IPO, the following preferred stock warrants issued under the original credit facility and subsequent amendments were outstanding and exercisable:
IssuanceExpirationSeries
Exercise
Price
Warrants
Outstanding at
May 7, 2018
Initial
Value
Fair Value at
May 7, 2018
February 8, 2018February 8, 2028F$1.37 233,577 $103 $320 
February 24, 2017February 24, 2027F1.37 29,197 40 
August 7, 2015August 7, 2025E2.62 29,580 33 41 
June 27, 2014June 27, 2024E2.62 76,334 85 174 
August 5, 2013August 5, 2023C1.07 74,768 39 80 
November 16, 2012November 16, 2022C1.07 186,916 96 200 
Total630,372 $855 
Summary of stock warrants outstanding
Warrants to purchase shares of our common stock are summarized below: 
Common Stock WarrantsWeighted Average Exercise PriceWeighted Average Remaining Contractual Life (years)
Outstanding at December 31, 2017— $— 
Preferred stock warrants converted to common stock warrants at IPO100,558 $9.38 
Exercised(93,963)$8.70 
Outstanding at December 31, 20186,595 $15.16 5.5