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Stock-Based Plans (Tables)

9 Months Ended

Sep. 30, 2020

Share-based Payment Arrangement [Abstract]

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, 2019						2,551						$	7.43
RSU granted						3,642						$	3.95
RSU released						(872)						$	7.30
RSU forfeited						(305)						$	6.39
Balance as of September 30, 2020						5,016						$	4.99

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, 2019						2,027						$	7.78					6.8						$	81
Options granted						105						$	3.74
Options exercised						(98)						$	4.90											$	352
Options forfeited						(408)						$	9.20
Balance as of September 30, 2020						1,626						$	7.34					6.4						$	2,514
Vested at September 30, 2020						1,259						$	7.86					6.0						$	1,799
Awards expected to vest at September 30, 2020						367						$	5.56					7.9						$	715

_______

(1)Aggregate intrinsic value as of September 30, 2020 was calculated as the difference between the closing price per share of our common stock on the last trading day of September 30, 2020, which was $7.43, 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, 2019						547						$	15.09
PSU granted						509						$	4.82
PSU released						—						$	—
PSU forfeited						(94)						$	14.26
Balance at September 30, 2020						962						$	9.74

Activity to date under this PSU award is as follows:

						Number of Units (in 000s)						Weighted-Average Grant Date Fair Value per Unit
Balance at December 31, 2019						64						$	7.05
PSU granted						—						$	—
PSU released						(4)						$	7.05
PSU forfeited						(12)						$	7.05
Balance at September 30, 2020						48						$	7.05

Schedule of stock-based compensation expense

At September 30, 2020, we had reserved shares of common stock for future issuance under equity compensation plans as follows:

(in 000's)						Securities To Be Issued Upon Exercise Of Options						Securities To Be Issued Upon Release Of Restricted Stock and Performance Share Units						Number Of Remaining Securities Available For Future Issuance
2009 Equity Incentive Plan						19						—						—
2011 Equity Incentive Plan						1,387						5,810						3,057
DVS Sciences Inc. 2010 Equity Incentive Plan						13						—						—
2017 Inducement Award Plan						207						216						—
2017 Employee Stock Purchase Plan						—						—						3,100
						1,626						6,026						6,157

Total stock-based compensation expense recognized was as follows (in thousands):

						Three Months Ended September 30,												Nine Months Ended September 30,
						2020						2019						2020						2019
Restricted stock units, stock options and performance share units						$	4,114					$	2,738					$	9,558					$	7,731
Employee stock purchase plan						243						291						800						561
Total stock-based compensation						$	4,357					$	3,029					$	10,358					$	8,292

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Tabular disclosure of share-based payment arrangement.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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