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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Fair Value Hierarchy
The following table represents the Company’s fair value hierarchy for its financial assets and liabilities measured at fair value (in thousands):
 
 
 
Fair Value at June 30, 2018
 
 
Fair Value at December 31, 2017
 
 
 
Level 1
 
 
Level 2
 
 
Level 3
 
 
Level 1
 
 
Level 2
 
 
Level 3
 
Assets
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Money market funds(1)
 
$
35,555
 
 
$
―
 
 
$
―
 
 
$
36,762
 
 
$
―
 
 
$
―
 
Asset-backed securities(2)
 
 
―
 
 
 
30,500
 
 
 
―
 
 
 
―
 
 
 
29,750
 
 
 
―
 
Corporate debt securities(3)
 
 
―
 
 
 
97,183
 
 
 
―
 
 
 
―
 
 
 
80,309
 
 
 
―
 
Total assets
 
$
35,555
 
 
$
127,683
 
 
$
―
 
 
$
36,762
 
 
$
110,059
 
 
$
―
 
Liabilities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Convertible notes payable
 
$
―
 
 
$
189,722
 
 
$
―
 
 
$
―
 
 
$
152,396
 
 
$
―
 
   
(1)
Classified as cash and cash equivalents as of June 30, 2018 and December 31, 2017, respectively (see Note 3).
 
(2)
Includes $30,500 and $16,007 classified as cash and cash equivalents as of June 30, 2018 and December 31, 2017, respectively (see Note 3).
 
(3)
Includes $18,547 and $43,056 classified as cash and cash equivalents as of June 30, 2018 and December 31, 2017, respectively (see Note 3).