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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Previously Reported [Member]
Common Stock [Member]
 [1]
Previously Reported [Member]
Additional Paid-in Capital [Member]
 [1]
Previously Reported [Member]
Retained Earnings [Member]
 [1]
Previously Reported [Member]
AOCI Attributable to Parent [Member]
 [1]
Previously Reported [Member]
 [1]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Total
Balances (in shares) at Dec. 31, 2015 [1]           10,685,599        
Balances at Dec. 31, 2015 [1]           $ 14,531 $ 8,526 $ 4,382 $ (1,109) $ 26,330
Exercise of stock options (in shares)           109,963       109,963
Exercise of stock options           $ 350 (204)     $ 146
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration (in shares)           (25,572)       (25,572)
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration           (363) $ (363)
Repurchase and retirement of shares (note 12) (in shares)           (308,416)       (308,416)
Repurchase and retirement of shares (note 12)           $ (421) (6,759)     $ (7,180)
Income tax effect related to stock options exercised             859     859
Stock-based compensation (note 13)             799     799
Net income               16,067   16,067 [2],[3]
Accretion of redeemable non-controlling interest in Ting Virginia, LLC. (note 3(a))               (49)   (49)
Other comprehensive income (loss) (note 7)                 1,209 1,209
Balances (in shares) at Dec. 31, 2016 [1]           10,461,574        
Balances at Dec. 31, 2016 [1]           $ 14,460 2,858 20,400 100 $ 37,818
Exercise of stock options (in shares)           172,759       172,759
Exercise of stock options           $ 908 (686)     $ 222
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration (in shares)           (50,454)       (50,454)
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration           (1,462) $ (1,462)
Repurchase and retirement of shares (note 12) (in shares)                  
Repurchase and retirement of shares (note 12)                  
Stock-based compensation (note 13)             1,457     1,457
Net income               22,327   22,327 [2],[3]
Accretion of redeemable non-controlling interest in Ting Virginia, LLC. (note 3(a))               (51)   (51)
Other comprehensive income (loss) (note 7)                 (100) (100)
Balances (in shares) at Dec. 31, 2017 10,583,879         10,583,879        
Balances at Dec. 31, 2017 $ 15,368 $ 2,167 $ 42,676 $ 60,211 $ 15,368 2,167 43,739 60,211 [4]
Adoption of Topic 606 (note 2)           1,063 $ 1,063
Exercise of stock options (in shares)           63,886       63,886
Exercise of stock options           $ 455 (343)     $ 112
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration (in shares)           (19,777)       (19,777)
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration           (445) $ (445)
Repurchase and retirement of shares (note 12) (in shares)                  
Repurchase and retirement of shares (note 12)                  
Stock-based compensation (note 13)             2,574     2,574
Net income               17,135   17,135
Accretion of redeemable non-controlling interest in Ting Virginia, LLC. (note 3(a))               (64)   (64)
Other comprehensive income (loss) (note 7)                 (810) (810)
Balances (in shares) at Dec. 31, 2018           10,627,988        
Balances at Dec. 31, 2018           $ 15,823 $ 3,953 $ 60,810 $ (810) $ 79,776
[1] The Company has initially applied ASC 2014-09 (Topic 606) using the modified retrospective method. Under this method, the comparative information is not restated.
[2] The Company has initially applied ASC 2014-09 (Topic 606) using the modified retrospective method. Under this method, the comparative information is not restated.
[3] The Company has initially applied ASC 2014-09 (Topic 606) using the modified retrospective method. Under this method, the comparative information is not restated.
[4] The Company has initially applied ASC 2014-09 (Topic 606) using the modified retrospective method. Under this method, the comparative information is not restated.