CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Allowances for sales returns and doubtful accounts	$ 958,000	$ 1,339,000
Stockholders' deficit:
Commons stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000	100,000
Common stock, shares issued	43,247	42,339
Common stock, shares outstanding	43,150	41,948
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000	1,000
Preferred stock, shares issued	0	0
Treasury stock, shares held	98	391