|3 Months Ended|
Mar. 31, 2021
2. Stock Plans
The following table summarizes option activity:
Approximately 670,000 options to purchase common shares were granted during the three month period ended March 31, 2021.
The following table summarizes the stock-based compensation expense recorded for awards under our stock option plans (in thousands):
We use the Black-Scholes-Merton option-pricing model with the following assumptions to estimate the fair value of our stock options:
As of March 31, 2021, there was approximately $1.3 million of total unrecognized compensation expense related to non-vested stock options. This expense is expected to be recognized over a weighted-average period of approximately 1.6 years.
The entire disclosure for share-based payment arrangement.
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef