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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Additional Paid-in Capital [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] AOCI Attributable to Parent [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Common Stock [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Additional Paid-in Capital [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] AOCI Attributable to Parent [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Previously Reported [Member] Common Stock [Member] | 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, 2017 |  |  |  |  |  |  | 10,583,879 |  |  |  |  |  |  |  |  |  |  | 10,583,879 | [1] |  |  |  |  |  |  |  |
Balances at Dec. 31, 2017 |  | $ 0 | $ 0 | $ 1,063 | $ 0 | $ 1,063 | $ 15,368 | $ 2,167 | $ 43,739 | $ 0 | $ 61,274 |  |  |  |  |  |  | $ 15,368 | [1] | $ 2,167 | [1] | $ 42,676 | [1] | $ 0 | [1] | $ 60,211 | [1]
Exercise of stock options (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 63,886 |  |  |  |  |  |  |  | 63,886 |
Exercise of stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 455 |  | (343) |  | 0 |  | 0 |  | $ 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  | (445) |  | 0 |  | 0 |  | $ (445) |
Stock-based compensation (note 14) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 2,574 |  | 0 |  | 0 |  | 2,574 |
Net income for the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 17,135 |  | 0 |  | 17,135 | [1],[2]
Accretion of redeemable non-controlling interest in Ting Virginia, LLC. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | (64) |  | 0 |  | (64) |
Other comprehensive income (loss) (note 7) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  | 0 |  | 0 |  | (810) |  | $ (810) |
Repurchase and retirement of shares (note 13(a)) (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Repurchase and retirement of shares (note 13(a)) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (19,777) |  |  |  |  |  |  |  | (19,777) |
Repurchase and retirement of shares (note 13(a)) (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Repurchase and retirement of shares (note 13(a)) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  | 0 |  | 17,135 |  | 0 |  | 17,135 | [1],[2]
Other comprehensive income (loss) (note 7) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  | 0 |  | 0 |  | (810) |  | (810) |
Balances (in shares) at Dec. 31, 2018 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,627,988 |  |  |  |  |  |  |  |  |
Balances at Dec. 31, 2018 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,823 |  | 3,953 |  | 60,810 |  | (810) |  | $ 79,776 |
Exercise of stock options (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80,319 |  |  |  |  |  |  |  | 80,319 |
Exercise of stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 967 |  | (572) |  | 0 |  | 0 |  | $ 395 |
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (21,332) |  |  |  |  |  |  |  | (21,332) |
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  | (548) |  | 0 |  | 0 |  | $ (548) |
Stock-based compensation (note 14) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 2,876 |  | 0 |  | 0 |  | 2,876 |
Net income for the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 15,398 |  | 0 |  | 15,398 |
Other comprehensive income (loss) (note 7) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  | 0 |  | 0 |  | 1,283 |  | $ 1,283 |
Repurchase and retirement of shares (note 13(a)) (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (101,816) |  |  |  |  |  |  |  | (101,816) |
Repurchase and retirement of shares (note 13(a)) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (157) |  | (4,829) |  | 0 |  | 0 |  | $ (4,986) |
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (21,332) |  |  |  |  |  |  |  | (21,332) |
Repurchase and retirement of shares (note 13(a)) (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (101,816) |  |  |  |  |  |  |  | (101,816) |
Repurchase and retirement of shares (note 13(a)) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (157) |  | (4,829) |  | 0 |  | 0 |  | $ (4,986) |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 15,398 |  | 0 |  | 15,398 |
Other comprehensive income (loss) (note 7) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  | 0 |  | 0 |  | 1,283 |  | 1,283 |
Balances (in shares) at Dec. 31, 2019 | [1] |  |  |  |  |  |  |  |  |  |  | 10,585,159 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balances at Dec. 31, 2019 |  |  |  |  |  |  |  |  |  |  |  | $ 16,633 | [1] | $ 880 | $ 76,208 | $ 473 | $ 94,194 |  |  |  |  |  |  |  |  | $ 94,194 |
Exercise of stock options (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 113,132 |  |  |  |  |  |  |  | 113,132 |
Exercise of stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,290 |  | (1,305) |  | 0 |  | 0 |  | $ 985 |
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (48,013) |  |  |  |  |  |  |  | (48,013) |
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  | (556) |  | 0 |  | 0 |  | $ (556) |
Stock-based compensation (note 14) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 3,718 |  | 0 |  | 0 |  | 3,718 |
Net income for the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 5,775 |  | 0 |  | 5,775 |
Other comprehensive income (loss) (note 7) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  | 0 |  | 0 |  | 1,863 |  | $ 1,863 |
Repurchase and retirement of shares (note 13(a)) (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (70,238) |  |  |  |  |  |  |  | (70,238) |
Repurchase and retirement of shares (note 13(a)) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (125) |  | (1,279) |  | (1,877) |  | 0 |  | $ (3,281) |
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (48,013) |  |  |  |  |  |  |  | (48,013) |
Repurchase and retirement of shares (note 13(a)) (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (70,238) |  |  |  |  |  |  |  | (70,238) |
Repurchase and retirement of shares (note 13(a)) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (125) |  | (1,279) |  | (1,877) |  | 0 |  | $ (3,281) |
Acquisition of Cedar Networks (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32,374 |  |  |  |  |  |  |  |  |
Acquisition of Cedar Networks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000 |  | 0 |  | 0 |  | 0 |  | 2,000 |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 5,775 |  | 0 |  | 5,775 |
Other comprehensive income (loss) (note 7) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  | 0 |  | 0 |  | 1,863 |  | 1,863 |
Balances (in shares) at Dec. 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,612,414 |  |  |  |  |  |  |  |  |
Balances at Dec. 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,798 |  | $ 1,458 |  | $ 80,106 |  | $ 2,336 |  | $ 104,698 |
[1] | The Company has initially applied ASC 2016-02 (Topic 842) on January 1, 2019 (note 2(u)). The accounting standard was adopted using the modified retrospective method, under this method the comparative period was not restated.
[2] | The Company has initially applied ASC 2016-02 (Topic 842) on January 1, 2019 (note 2 (u)). The accounting standard was adopted using the modified retrospective method, under this method the comparative period was not restated.

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