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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2019
Fair Value Disclosures [Abstract]  
Summary of Fair Value Measurements of Cash Equivalents, Available-for-Sale Marketable Securities and Free Share Asset/Liability
The fair value measurements of the Company’s cash equivalents, available-for-sale marketable securities and the free share asset/liability are identified at the following levels within the fair value hierarchy (in thousands):
 
September 30, 2019
Fair Value Measurements
 
Total
 
Level 1
 
Level 2
 
Level 3
Assets:
 
 
 
 
 
 
 
Cash equivalents:
 
 
 
 
 
 
 
Money market funds
$
77,213

 
$
77,213

 
$

 
$

Total
77,213

 
77,213

 

 

Marketable securities:
 
 
 
 
 
 
 
Commercial paper securities
180,812

 

 
180,812

 

Corporate debt securities
71,114

 

 
71,114

 

U.S. government-sponsored entity debt securities
41,424

 

 
41,424

 

Total
293,350

 

 
293,350

 

Total cash equivalents and marketable securities
$
370,563

 
$
77,213

 
$
293,350

 
$

 
 
 
 
 
 
 
 
Free shares asset
$
239

 
$

 
$

 
$
239

 
December 31, 2018
Fair Value Measurements
 
Total
 
Level 1
 
Level 2
 
Level 3
Assets:
 
 
 
 
 
 
 
Cash equivalents:
 
 
 
 
 
 
 
Money market funds
$
103,291

 
$
103,291

 
$

 
$

Total
103,291

 
103,291

 

 

Marketable securities:
 
 
 
 
 
 
 
Commercial paper securities
177,224

 

 
177,224

 

Corporate debt securities
63,870

 

 
63,870

 

U.S. government-sponsored entity debt securities
18,621

 

 
18,621

 

Total
259,715

 

 
259,715

 

Total cash equivalents and marketable securities
$
363,006

 
$
103,291

 
$
259,715

 
$

Liabilities:
 
 
 
 
 
 
 
Free shares liability
$
154

 
$

 
$

 
$
154


Summary of Estimated Fair Value of Free Shares Valuation Assumptions
Free Shares valuation assumptions:

September 30,
2019

December 31, 2018
Sangamo Stock Price (USD)

$
9.05


$
11.48

TxCell Stock Price (EUR)

2.23


2.58

EUR / USD Exchange Rate

0.91


0.87

Estimated Correlation Sangamo and TxCell Stock Prices

100.0%



Sangamo Stock Price (USD) Volatility Estimate

75.0%


79.9%

TxCell Stock Price (EUR) Volatility Estimate

75.0%


8.6%

EUR / USD Exchange Rate Volatility Estimate

6.8%


7.7%

Risk Free Rate and Cost of Debt by Expected Exercise Date

Varies


Varies