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Shareholders' Equity (Tables)
3 Months Ended
Mar. 31, 2022
Equity [Abstract]  
Schedule of Common Stock Reserved for Future Issuance
As of March 31, 2022, we had reserved shares of common stock for future issuance under equity compensation plans as follows:
In thousandsSecurities To Be Issued Upon Exercise Of Options Securities To Be Issued Upon Release Of Restricted Stock and Performance Share Units at MaximumNumber Of Remaining Securities Available For Future Issuance
2011 Equity Incentive Plan1,376 7,259 3,561 
DVS Sciences Inc. 2010 Equity Incentive Plan— — 
2017 Inducement Award Plan159 57 — 
2017 Employee Stock Purchase Plan— — 2,633 
1,541 7,316 6,194 
Total stock-based compensation expense recognized was as follows (in thousands):
Three Months Ended March 31,
20222021
Restricted stock units, stock options and performance share units$3,942 $3,473 
Employee stock purchase plan100 204 
Total stock-based compensation$4,042 $3,677