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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2020
Fair Value Disclosures [Abstract]  
Fair Value Hierarchy for Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

The following table represents the fair value hierarchy for our financial assets (cash equivalents and marketable securities) and liabilities measured at fair value on a recurring basis (in thousands):

 

 

Level 1

 

 

Level 2

 

 

Level 3

 

 

Total

 

June 30, 2020

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Assets

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Money market funds

$

24,187

 

 

$

-

 

 

$

-

 

 

$

24,187

 

U.S. treasuries

 

-

 

 

 

22,222

 

 

 

-

 

 

 

22,222

 

U.S. government agency securities

 

-

 

 

 

54,405

 

 

 

-

 

 

 

54,405

 

Corporate debt securities

 

-

 

 

 

92,159

 

 

 

-

 

 

 

92,159

 

Total assets

$

24,187

 

 

$

168,786

 

 

$

-

 

 

$

192,973

 

Liabilities

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Warrant liability

$

-

 

 

$

-

 

 

$

31,905

 

 

$

31,905

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Level 1

 

 

Level 2

 

 

Level 3

 

 

Total

 

December 31, 2019

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Assets

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Money market funds

$

27,854

 

 

$

-

 

 

$

-

 

 

$

27,854

 

U.S. treasuries

 

-

 

 

 

6,517

 

 

 

-

 

 

 

6,517

 

U.S. government agency securities

 

-

 

 

 

51,273

 

 

 

-

 

 

 

51,273

 

Corporate debt securities

 

-

 

 

 

61,373

 

 

 

-

 

 

 

61,373

 

Total assets

$

27,854

 

 

$

119,163

 

 

$

-

 

 

$

147,017

 

Liabilities

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Warrant liability

$

-

 

 

$

-

 

 

$

14,860

 

 

$

14,860

 

Sublicense liability

 

-

 

 

 

-

 

 

 

6,948

 

 

 

6,948

 

Total liabilities

$

-

 

 

$

-

 

 

$

21,808

 

 

$

21,808

 

Summary of Assumptions to Estimate the Fair Value of Warrant Liability

As of June 30, 2020, we used the following key assumptions to estimate the fair value of warrant liability:

 

Number of shares

 

 

5,841,250

 

Expected term

 

1.6 years

 

Expected volatility

 

 

0.9

 

Risk-free interest rate

 

 

0.2

%

Dividend yield

 

 

0

%

Summary of Changes in Fair Value Warrant liability

The following table provides a summary of changes in the fair value warrant liability for the six months ended June 30, 2020 (in thousands):

 

Balance at December 31, 2019

 

$

14,860

 

Increase in the estimated fair value of warrant liability upon revaluation

 

 

17,045

 

Balance at June 30, 2020

 

$

31,905