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Stock-Based Plans (Tables)
 3 Months Ended
Mar. 31, 2022
Share-based Payment Arrangement [Abstract]  
Schedule of Activity Under Restricted Stock Units
Activity under the various plans was as follows:
Restricted Stock Units:
Number of Units
 (in 000s)		Weighted-Average
Grant Date Fair Value per Unit
Balance at December 31, 20215,141 $5.18 
RSU granted808 $3.62 
RSU released(302)$5.40 
RSU forfeited(70)$5.30 
Balance at March 31, 20225,577 $4.94 
Schedule of Activity Under Stock Options
Stock Options:
 Number of
Options (000s)		Weighted-Average
Exercise Price
per Option		Weighted-
Average Remaining Contractual Life (in Years)
Aggregate
Intrinsic
Value (1) in (000s)
Balance at December 31, 20211,597 $7.08 5.6$82 
Options granted— $— $— 
Options exercised(8)$2.63 $7 
Options forfeited(47)$14.84 $— 
Balance as of March 31, 20221,542 $6.87 5.6$35 
Vested at March 31, 20221,469 $6.89 5.4$35 
Unvested awards at March 31, 202273 $6.34 8.4$— 
_______
(1)Aggregate intrinsic value as of March 31, 2022 was calculated as the difference between the closing price per share of our common stock on the last trading day of March 31, 2022, which was $3.59, and the exercise price of the options, multiplied by the number of in-the-money options.
Schedule of Nonvested Performance-Based Units Activity
Activity under the TSR-based PSUs is as follows:
Number of Units
(in 000s)		Weighted-Average
Grant Date Fair Value per Unit
Balance at December 31, 20211,210 $10.11 
PSU granted— $— 
Performance adjustment for 2019 awards(341)$16.97 
PSU released— $— 
PSU forfeited— $— 
Balance at March 31, 2022869 $7.00 
Schedule of Stock-Based Compensation Expense
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 Plan6 — — 
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