Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - Compensation Cost (Details)

v3.10.0.1
Stock-based Compensation - Compensation Cost (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]        
Stock-based compensation expense $ 458,000 $ 407,000 $ 1,351,000 $ 1,241,000
Tax benefit from compensation expense 0 0 0 0
Cash received from option exercised $ 0 $ 0 $ 0 $ 0