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STOCKHOLDERS' EQUITY- Common stock issued in option exercise (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Options exercised | 143,000 | 193,000 | 165,400
Exercise price | $ 3.29 | $ 2.96 | $ 2.63
Shares issued | 103,113 | 153,113 | 133,308
Shares retained | 39,887 | 39,887 | 32,092
Cash paid at exercise |  | $ 100,000 | $ 0
Stock price on date of exercise | $ 11.80 | $ 10.58 | $ 13.18
Aggregate value of shares retained | $ 470,750 | $ 470,750 | $ 435,785
Exercised Option 1 |  |  |
Options exercised | 25,000 | 110,000 | 4,100
Exercise price | $ 7.50 | $ 2.00 | $ 2.00
Shares issued | 9,829 | 90,375 | 3,491
Shares retained | 15,171 | 19,625 | 609
Cash paid at exercise |  | $ 0 | $ 0
Stock price on date of exercise | $ 12.36 | $ 11.21 | $ 13.47
Aggregate value of shares retained | $ 187,500 | $ 220,000 | $ 8,200
Exercised Option 2 |  |  |
Options exercised | 3,000 | 50,000 | 60,000
Exercise price | $ 8.00 | $ 2.00 | $ 2.00
Shares issued | 1,059 | 50,000 | 50,156
Shares retained | 1,941 | 0 | 9,844
Cash paid at exercise |  | $ 100,000 | $ 0
Stock price on date of exercise | $ 12.36 | $ 8.00 | $ 12.19
Aggregate value of shares retained | $ 24,000 | $ 0 | $ 120,000
Exercised Option 3 |  |  |
Options exercised | 3,000 | 25,000 | 200
Exercise price | $ 5.25 | $ 7.50 | $ 8.00
Shares issued | 1,750 | 9,829 | 116
Shares retained | 1,250 | 15,171 | 84
Cash paid at exercise |  | $ 0 | $ 0
Stock price on date of exercise | $ 12.36 | $ 12.36 | $ 13.75
Aggregate value of shares retained | $ 15,750 | $ 187,500 | $ 1,600
Exercised Option 4 |  |  |
Options exercised | 2,000 | 3,000 | 1,500
Exercise price | $ 11.75 | $ 8.00 | $ 10.89
Shares issued | 100 | 1,059 | 1,188
Shares retained | 1,900 | 1,941 | 312
Cash paid at exercise |  | $ 0 | $ 0
Stock price on date of exercise | $ 12.36 | $ 12.36 | $ 13.75
Aggregate value of shares retained | $ 23,500 | $ 24,000 | $ 16,335
Exercised Option 5 |  |  |
Options exercised | 110,000 | 3,000 | 600
Exercise price | $ 2.00 | $ 5.25 | $ 5.25
Shares issued | 90,375 | 1,750 | 229
Shares retained | 19,625 | 1,250 | 371
Cash paid at exercise |  | $ 0 | $ 0
Stock price on date of exercise | $ 11.21 | $ 12.36 | $ 13.75
Aggregate value of shares retained | $ 220,000 | $ 15,750 | $ 3,150
Exercised Option 6 |  |  |
Options exercised |  | 2,000 | 20,000
Exercise price |  | $ 11.75 | $ 5.50
Shares issued |  | 100 | 11,953
Shares retained |  | 1,900 | 8,047
Cash paid at exercise |  | $ 0 | $ 0
Stock price on date of exercise |  | $ 12.36 | $ 13.67
Aggregate value of shares retained |  | $ 23,500 | $ 110,000
Exercised Option 7 |  |  |
Options exercised |  |  | 2,000
Exercise price |  |  | $ 8.00
Shares issued |  |  | 830
Shares retained |  |  | 1,170
Cash paid at exercise |  |  | $ 0
Stock price on date of exercise |  |  | $ 13.67
Aggregate value of shares retained |  |  | $ 16,000
Exercised Option 8 |  |  |
Options exercised |  |  | 2,000
Exercise price |  |  | $ 5.25
Shares issued |  |  | 1,232
Shares retained |  |  | 768
Cash paid at exercise |  |  | $ 0
Stock price on date of exercise |  |  | $ 13.67
Aggregate value of shares retained |  |  | $ 10,500
Exercised Option 9 |  |  |
Options exercised |  |  | 15,000
Exercise price |  |  | $ 2.00
Shares issued |  |  | 12,875
Shares retained |  |  | 2,125
Cash paid at exercise |  |  | $ 0
Stock price on date of exercise |  |  | $ 14.12
Aggregate value of shares retained |  |  | $ 30,000
Exercised Option 10 |  |  |
Options exercised |  |  | 60,000
Exercise price |  |  | $ 2.00
Shares issued |  |  | 51,238
Shares retained |  |  | 8,762
Cash paid at exercise |  |  | $ 0
Stock price on date of exercise |  |  | $ 13.70
Aggregate value of shares retained |  |  | $ 120,000

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