Annual report pursuant to Section 13 and 15(d)

Stock-based Compensation - Compensation Cost (Details)

v3.21.1
Stock-based Compensation - Compensation Cost (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Stock-based compensation expense $ 2,220,000 $ 1,828,000
Tax benefit from compensation expense 0 0
Cash received from option exercised $ 2,000 $ 12,000