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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Measurements [Abstract]  
Fair Value Hierarchy
The following table represents the Company’s fair value hierarchy for its financial assets and liabilities measured at fair value on a recurring basis (in thousands):
 
 
 
Fair Value at December 31, 2017
 
Fair Value at December 31, 2016
 
 
 
Level 1
 
Level 2
 
Level 3
 
Level 1
 
Level 2
 
Level 3
 
Assets
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Money market funds(1)
 
$
36,762
 
$
—
 
$
—
 
$
95,896
 
$
—
 
$
—
 
Asset-backed securities(2)
 
 
—
 
 
29,750
 
 
—
 
 
—
 
 
42,632
 
 
—
 
Corporate debt securities(3)
 
 
—
 
 
80,309
 
 
—
 
 
—
 
 
79,470
 
 
—
 
Total cash equivalents and marketable securities
 
$
36,762
 
$
110,059
 
$
—
 
$
95,896
 
$
122,102
 
$
—
 
Liabilities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Convertible notes payable
 
$
—
 
$
152,396
 
$
—
 
$
—
 
$
141,989
 
$
—
 
 
(1)
Classified as cash and cash equivalents as of December 31, 2017 and 2016, respectively (see Note 3).
(2)
Includes $16,007 and $19,000 classified as cash and cash equivalents as of December 31, 2017 and 2016, respectively (see Note 3).
(3)
Includes $43,056 and $11,976 classified as cash and cash equivalents as of December 31, 2017 and 2016, respectively (see Note 3).