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Equity Incentive Awards (Tables)
 3 Months Ended
Mar. 31, 2020
Share-based Payment Arrangement [Abstract]  
Summary of Stock Options Activity
The following table summarizes the Company’s option activity and related information:
Number of
Options
(in thousands)		Weighted-
Average
Exercise Price
Balance at December 31, 20198,995  $7.19  
Options granted1,594  15.15  
Options exercised(1,310) 7.37  
Options forfeited(207) 14.05  
Balance at March 31, 20209,072  $8.41  
Exercisable as of March 31, 20202,785  $6.89  
Summary of Restricted Stock Units Activity
The following table summarizes the Company’s RSUs activity and related information:
Number of Units
(in thousands)		Weighted-
Average Grant-
Date Fair Value
Outstanding at December 31, 20191,121  $4.59  
Granted104  15.75  
Vested and released(462) 4.75  
Forfeited(28) 8.39  
Outstanding at March 31, 2020735  $5.94  
Stock-Based Compensation Expense
The following table presents, by operating expense, the Company’s stock-based compensation expense:
Three Months Ended
March 31,
20202019
(In thousands)
Research and development$1,248  $631  
General and administrative2,161  1,131  
Total stock-based compensation expense$3,409  $1,762