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Fair Value Measurements
9 Months Ended
Sep. 30, 2018
Fair Value Disclosures [Abstract]  
Fair Value Measurements
Fair Value Measurements
The Company establishes the fair value of its assets and liabilities using the price that would be received to sell an asset or paid to transfer a financial liability in an orderly transaction between market participants at the measurement date. A fair value hierarchy is used to measure fair value. The three levels of the fair value hierarchy are as follows:
Level 1 — Quoted prices in active markets for identical assets and liabilities.
Level 2 — Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which all significant inputs and significant value drivers are observable in active markets.
Level 3 — Valuations derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable.
The recorded amounts of certain financial instruments, including cash, accounts receivable, prepaid expenses and other, accounts payable and accrued liabilities, approximate fair value due to their relatively short-term maturities. The recorded amount of the Company’s long-term debt approximates fair value because the related interest rates approximate rates currently available to the Company.
The Company’s available-for-sale securities by level within the fair value hierarchy were as follows (in thousands):
As of September 30, 2018
Level 1
 
Level 2
 
Level 3
 
Total
Cash equivalents:
 
 
 
 
 
 
 
Money market fund
$
13,761

 
$

 
$

 
$
13,761

Short-term investments:
 
 
 
 
 
 
 
Corporate debt securities

 
48,952

 

 
48,952

U.S. government-related debt securities

 
17,882

 

 
17,882

Asset-backed securities

 
6,897

 

 
6,897

Total
$
13,761

 
$
73,731

 
$

 
$
87,492

 
 
 
 
 
 
 
 
As of December 31, 2017
Level 1
 
Level 2
 
Level 3
 
Total
Cash equivalents:
 
 
 
 
 
 
 
Money market fund
$
22,398

 
$

 
$

 
$
22,398

Short-term investments:
 
 
 
 
 
 
 
Corporate debt securities

 
35,514

 

 
35,514

U.S. government-related debt securities

 
15,905

 

 
15,905

Total
$
22,398

 
$
51,419

 
$

 
$
73,817