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Fair Value Measurement
12 Months Ended
Dec. 31, 2019
Fair Value Disclosures [Abstract]  
Fair Value Measurement

9.   Fair Value Measurement

Assets and liabilities measured at fair value on a recurring basis consist of the following as of December 31, 2019 (in thousands):

Fair Value Measurements at Reporting Date Using

    

    

Quoted Prices in

    

Significant

    

Active Markets

Other

Significant

for Identical

Observable

Unobservable

December 31,

Assets/Liabilities

Inputs

Inputs

2019

(Level 1)

(Level 2)

(Level 3)

Assets:

 

  

 

  

 

  

 

  

Money market funds

$

30,693

$

30,693

$

$

Marketable securities:

 

  

 

  

 

  

 

  

Corporate debt securities

 

42,709

 

 

42,709

 

Tax-exempt municipal securities

 

23,198

 

 

23,198

 

Variable rate demand notes

 

5,600

 

 

5,600

 

Total assets at fair value on a recurring basis

$

102,200

$

30,693

$

71,507

$

Liabilities:

 

  

 

  

 

  

 

  

Deferred payments

$

3,257

$

$

$

3,257

Assets and liabilities measured at fair value on a recurring basis consist of the following as of December 31, 2018 (in thousands):

Fair Value Measurements at Reporting Date Using

    

    

Quoted Prices in

    

Significant

    

Active Markets

Other

Significant

for Identical

Observable

Unobservable

December 31,

Assets/Liabilities

Inputs

Inputs

2018

(Level 1)

(Level 2)

(Level 3)

Assets:

 

  

 

  

 

  

 

  

Money market funds

$

1,791

$

1,791

$

$

Marketable securities:

 

  

 

  

 

  

 

  

Corporate debt securities

 

48,430

 

 

48,430

 

Tax-exempt municipal securities

 

22,869

 

 

22,869

 

Variable rate demand notes

 

4,000

 

 

4,000

 

Total assets at fair value on a recurring basis

$

77,090

$

1,791

$

75,299

$

Liabilities:

 

  

 

  

 

  

 

  

Deferred payments

$

4,120

$

$

$

4,120

The Company measures the above items on a recurring basis at fair value as follows:

Money market funds — Classified in Level 1 is excess cash the Company holds in both taxable and tax-exempt money market funds, which are included in cash and cash equivalents in the accompanying consolidated balance sheets. The Company records any net unrealized gains and losses for changes in fair value as a component of accumulated other comprehensive income in stockholders’ equity. The Company’s cash and cash equivalents held at December 31, 2018 and 2019, approximate fair value and are not disclosed in the above tables because of the short-term nature of the financial instruments.
Marketable securities – Classified in Level 2 and valued using readily available pricing sources for comparable instruments utilizing observable inputs from active markets. The Company does not hold securities in inactive markets.
Deferred payments — The Company acquired certain assets and entered into deferred payment arrangements with the sellers in transactions that occurred in 2011 and 2016. The deferred payments are classified within Level 3 as there is no liquid market for similarly priced instruments and are valued using discounted cash flow models that encompass significant unobservable inputs. The assumptions used to prepare the discounted cash flows include estimates for interest rates, enrollment growth, retention rates, and pricing strategies. These assumptions are subject to change as the underlying data sources evolve and the programs mature. The short-term portion of deferred payments was $1.6 million as of December 31, 2019 and is included in accounts payable and accrued expense.

The Company did not change its valuation techniques associated with recurring fair value measurements from prior periods and did not transfer assets or liabilities between levels of the fair value hierarchy during the years ended December 31, 2018 or 2019.

Changes in the fair value of the Company’s Level 3 liabilities during the years ended December 31, 2018 and 2019 are as follows (in thousands):

    

December 31,

    

December 31,

2018

2019

Balance as of the beginning of period

$

4,514

$

4,120

Amounts paid

 

(1,412)

 

(1,579)

Other adjustments to fair value

 

1,018

 

716

Balance at end of period

$

4,120

$

3,257