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Stockholder's Equity (Tables)
3 Months Ended
Mar. 31, 2021
Share-based Payment Arrangement [Abstract]  
Summary of Stock Option Activity
Activity of stock options under the 2005 Plan, 2011 Plan and 2014 Plan (collectively, the "Plans") is set forth below:
Number of SharesWeighted-Average
Exercise Price
Balance at December 31, 20201,020,978 $23.38 
Exercised(42,408)15.70 
Canceled/Forfeited— — 
Balance at March 31, 2021978,570 23.71 
Summary of Unvested Restricted Stock and Restricted Stock Unit Activity
Activity of unvested restricted stock awards and restricted stock units under the Plans during the three months ended March 31, 2021 is set forth below: 
Number of SharesWeighted -Average
Grant Date Fair Value
Unvested at December 31, 2020369,629 $163.03 
Granted53,080 255.00 
Released/Vested - Restricted Stock/RSUs(36,672)140.42 
Canceled/Forfeited(4,182)175.99 
Unvested at March 31, 2021381,855 177.84 
Schedule of Stock-based Compensation Expense
The following table sets forth the stock-based compensation expense included in the Company’s condensed consolidated statements of operations for the three months ended March 31, 2021 and 2020 (in thousands):
 Three Months Ended March 31,
 20212020
Cost of revenue$798 $648 
Research and development1,062 874 
Sales, general and administrative4,535 4,167 
Total$6,395 $5,689