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Stock-Based Compensation
 6 Months Ended
Jun. 30, 2021
Share-based Payment Arrangement [Abstract]  
Stock-Based Compensation
NOTE 8—STOCK-BASED COMPENSATION
The Company's Stock Incentive Plan allows for grants of incentive stock options, non-statutory stock options, restricted stock awards, restricted stock units, and other stock-based or cash-based awards.
Stock-Based Compensation Expense
Stock-based compensation expense consisted of the following:
Three Months Ended June 30,Six Months Ended June 30,
(in thousands)2021202020212020
Stock options$1,861 $1,755 $3,771 $3,459 
Restricted stock units3,088 2,282 6,052 4,253 
Total$4,949 $4,037 $9,823 $7,712 
Stock Options
During the six months ended June 30, 2021, the Company granted a total of 533,105 stock options at a weighted average grant date fair value of $17.52 per share. As of June 30, 2021, unrecognized costs related to outstanding stock options totaled $15.6 million,
before any related tax benefit. As of June 30, 2021, unrecognized costs related to stock options are expected to be recognized over a weighted average period of 2.77 years.
Restricted Stock Units
During the six months ended June 30, 2021, the Company granted 171,773 restricted stock units at a weighted average grant date fair value of $96.16 per share. As of June 30, 2021, unrecognized costs related to outstanding restricted stock units totaled $26.3 million, before any related tax benefit. As of June 30, 2021, unrecognized costs related to restricted stock units are expected to be recognized over a weighted average period of 2.53 years.