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Fair Value Measurement (Tables)
9 Months Ended
Sep. 30, 2018
Fair Value Disclosures [Abstract]  
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis
The following table sets forth the fair value of the Company’s financial assets and liabilities measured at fair value on a recurring basis based on the three-tier fair value hierarchy (in thousands):
 
September 30, 2018
 
Level 1
 
Level 2
 
Level 3
 
Total
Assets
 
 
 
 
 
 
 
Money market funds[1]
$
13,668

 
$

 
$

 
$
13,668

 
 
 
 
 
 
 
 
Liabilities
 
 
 
 
 
 
 
Redeemable convertible preferred stock warrants
$

 
$

 
$
1,103

 
$
1,103

 
 
 
 
 
 
 
 
 
December 31, 2017
 
Level 1
 
Level 2
 
Level 3
 
Total
Assets
 
 
 
 
 
 
 
Money market funds[1]
$
22,115

 
$

 
$

 
$
22,115

 
 
 
 
 
 
 
 
Liabilities
 
 
 
 
 
 
 
Redeemable convertible preferred stock warrants
$

 
$

 
$
422

 
$
422

 
[1]
Included in cash and cash equivalents on the consolidated balance sheet
Summary of Changes in Fair Value of the Redeemable Convertible Preferred Stock Warrants
The following table sets forth a summary of the changes in the fair value of the redeemable convertible preferred stock warrants, the Company’s Level 3 financial liability, which is measured on a recurring basis (in thousands):
 
 
Balances at December 31, 2017
$
422

Change in fair value recorded in other (income) expense, net
681

Balances at September 30, 2018
$
1,103