CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
CURRENT ASSETS:
Trade receivables, allowances	$ 4,687	$ 3,108
STOCKHOLDERS' EQUITY:
Preferred stock shares authorized (in shares)	5,000	5,000
Preferred stock shares issued (in shares)	0	0
Common stock shares authorized (in shares)	100,000	100,000
Common stock shares issued (in shares)	55,538	55,213
Common stock shares outstanding (in shares)	55,538	55,213
Developed technology
OTHER ASSETS:
Intangibles, accumulated amortization	$ 182,148	$ 149,947
Other
OTHER ASSETS:
Intangibles, accumulated amortization	$ 56,913	$ 65,607