Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Consolidated Balance Sheets [Abstract]
Accounts receivable, allowances	$ 682	$ 143
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	61,840,434	47,470,505
Common stock, shares outstanding	53,595,978	35,657,344
Treasury stock, shares	8,244,456	11,813,161