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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2016
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 (in thousands):
 
 
 
Fair Value at September 30, 2016
 
Fair Value at December 31, 2015
 
Assets
 
Level 1
 
Level 2
 
Level 3
 
Level 1
 
Level 2
 
Level 3
 
Money market funds
 
$
89,623
 
$
—
 
$
—
 
$
14,950
 
$
—
 
$
—
 
U.S. Treasury securities
 
 
—
 
 
15,078
 
 
—
 
 
—
 
 
—
 
 
—
 
Government-backed security
 
 
—
 
 
22,000
 
 
—
 
 
—
 
 
20,000
 
 
—
 
Asset-backed securities
 
 
—
 
 
43,151
 
 
—
 
 
—
 
 
28,924
 
 
—
 
Corporate debt securities
 
 
—
 
 
122,106
 
 
—
 
 
—
 
 
137,213
 
$
—
 
Total assets
 
$
89,623
 
$
202,335
 
$
—
 
$
14,950
 
$
186,137
 
$
—
 
Liabilities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Convertible notes payable
 
$
—
 
$
176,774
 
$
—
 
$
—
 
$
—
 
$
—