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Stock-Based Plans - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019	Jan. 17, 2020
Number of Options (000s)
Beginning Balance (shares)	2,027
Options granted (shares)	105
Option exercised (shares)	(98)
Options forfeited (shares)	(408)
Ending Balance (shares)	1,626	2,027
Vested (shares)	1,259
Unvested awards (shares)	367
Weighted-Average Exercise Price per Option
Beginning Balance (usd per share)	$ 7.78
Options granted (usd per share)	3.74
Options exercised (usd per share)	4.90
Options forfeited (usd per share)	9.20
Ending Balance (usd per share)	7.34	$ 7.78
Vested (usd per share)	7.86
Unvested awards (usd per share)	$ 5.56
Weighted- Average Remaining Contractual Life (in Years)
Contractual term	6 years 4 months 24 days	6 years 9 months 18 days
Vested	6 years
Unvested awards	7 years 10 months 24 days
Aggregate Intrinsic Value
Outstanding	$ 2,514	$ 81
Options exercised	352
Vested	1,799
Unvested awards	$ 715
Share price (usd per share)	$ 7.43		$ 4.22

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