CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
CURRENT ASSETS:
Trade receivables, allowances	$ 2,355	$ 1,769
STOCKHOLDERS’ EQUITY:
Preferred stock shares authorized (in shares)	5,000,000	5,000,000
Preferred stock shares issued (in shares)	0	0
Common stock shares authorized (in shares)	100,000,000	100,000,000
Common stock shares issued (in shares)	54,893,000	50,248,000
Common stock shares outstanding (in shares)	54,893,000	50,248,000
Other
OTHER ASSETS:
Intangibles, accumulated amortization	$ 49,136	$ 38,127
Developed technology
OTHER ASSETS:
Intangibles, accumulated amortization	$ 102,357	$ 72,420