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Fair Value Measurements
3 Months Ended
Mar. 31, 2020
Fair Value Disclosures [Abstract]  
Fair Value Measurements

3. Fair Value Measurements

The Company’s convertible preferred stock liability represented a Level 3 financial liability measured at fair value on a recurring basis prior to its extinguishment as of December 31, 2019. Accordingly, there was no Level 3 financial liability as of March 31, 2020.

 

For the three months ended March 31, 2019, changes in the fair value of the Company’s Level 3 financial liability were measured on a recurring basis as follows (in thousands):

 

 

 

Three Months Ended

 

 

 

March 31, 2019

 

Beginning balance

 

$

1,671

 

Revaluation of convertible preferred stock liability recorded in

   other income, net

 

 

(437

)

Ending balance

 

$

1,234

 

 

The Company’s convertible preferred stock liability resulted from the initial sale of Series A convertible preferred stock where the investors committed to purchase additional shares of Series A convertible preferred stock in subsequent closings, contingent upon the achievement by the Company of certain development milestones and approval by the board of directors. The investors’ commitment to purchase and the Company’s commitment to sell shares of Series A convertible preferred stock represented a freestanding instrument accounted for at fair value and re-measured at each reporting date. The Company estimated the fair value of this commitment using the Black-Scholes option-pricing model using the following assumptions:

 

 

 

Three Months Ended

 

 

 

 

March 31, 2019

 

 

Stock price

 

$

0.99

 

 

Exercise price

 

$

1.00

 

 

Expected term (years)

 

0.24-2.25

 

 

Expected volatility

 

 

72.0

 

%

Risk-free interest rate

 

2.3-2.4

 

%