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Stock-Based Plans (Tables) | 9 Months Ended
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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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