Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Status Of Options (Details)

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Stockholders' Equity - Status Of Options (Details) - USD ($)
1 Months Ended 12 Months Ended
May 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Equity [Abstract]        
Number of shares outstanding   1,694,068 578,813 915,572
Weighted-average exercise (dollars per share)   $ 4.57 $ 6.51 $ 4.96
Weighted-average remaining life   3 years 9 months 8 days    
Intrinsic value, outstanding options   $ 6,000    
Number of shares vested and exercisable   678,264    
Number of shares, weighted average price per share   $ 5.21    
Exercisable period of shares 5 years 2 years 10 months 10 days