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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Balance at Dec. 31, 2017 $ 176,309 $ 12 $ 95,963 $ 80,334
Balance, shares at Dec. 31, 2017   11,632    
Issuance of shares of common stock under restricted stock award agreements, shares   74    
Forfeiture of shares of common stock under restricted stock award agreements, shares   (16)    
Stock-based compensation 2,961   2,961  
Shares issued for exercise of stock options 450   450  
Shares issued for exercise of stock options, shares   17    
Shares issued in Public Offering, net of offering costs 76,618 $ 1 76,617  
Shares issued in Public Offering, net of offering costs,shares   1,390    
Net income 12,835     12,835
Balance at Sep. 30, 2018 269,173 $ 13 175,991 93,169
Balance, shares at Sep. 30, 2018   13,097    
Balance at Jun. 30, 2018 187,637 $ 12 98,087 89,538
Balance, shares at Jun. 30, 2018   11,697    
Issuance of shares of common stock under restricted stock award agreements, shares   5    
Stock-based compensation 1,105   1,105  
Shares issued for exercise of stock options 182   182  
Shares issued for exercise of stock options, shares   5    
Shares issued in Public Offering, net of offering costs 76,618 $ 1 76,617  
Shares issued in Public Offering, net of offering costs,shares   1,390    
Net income 3,631     3,631
Balance at Sep. 30, 2018 269,173 $ 13 175,991 93,169
Balance, shares at Sep. 30, 2018   13,097    
Balance at Dec. 31, 2018 275,533 $ 13 177,683 97,837
Balance, shares at Dec. 31, 2018   13,126    
Issuance of shares of common stock under restricted stock award agreements, shares   64    
Forfeiture of shares of common stock under restricted stock award agreements, shares   (4)    
Stock-based compensation 4,186   4,186  
Shares issued for exercise of stock options 2,077   2,077  
Shares issued for exercise of stock options, shares   73    
Shares issued in Public Offering, net of offering costs 172,945 $ 2 172,943  
Shares issued in Public Offering, net of offering costs,shares   2,300    
Net income 15,247     15,247
Balance at Sep. 30, 2019 469,988 $ 15 356,889 113,084
Balance, shares at Sep. 30, 2019   15,559    
Balance at Jun. 30, 2019 289,341 $ 13 181,111 108,217
Balance, shares at Jun. 30, 2019   13,219    
Issuance of shares of common stock under restricted stock award agreements, shares   1    
Forfeiture of shares of common stock under restricted stock award agreements, shares   (4)    
Stock-based compensation 1,470   1,470  
Shares issued for exercise of stock options 1,365   1,365  
Shares issued for exercise of stock options, shares   43    
Shares issued in Public Offering, net of offering costs 172,945 $ 2 172,943  
Shares issued in Public Offering, net of offering costs,shares   2,300    
Net income 4,867     4,867
Balance at Sep. 30, 2019 $ 469,988 $ 15 $ 356,889 $ 113,084
Balance, shares at Sep. 30, 2019   15,559