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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock | Additional Paid-in Capital | Treasury Stock | Retained Earnings | Total
--- | --- | --- | --- | --- | ---
Balance at the beginning at Dec. 31, 2021 | $ 41 | $ 80,397 | $ (6,513) |  | $ 73,925
Balance at the beginning (in shares) at Dec. 31, 2021 | 39,737,890 |  |  |  |
Exercised and vested stock-based awards |  | 3 |  |  | 3
Exercised and vested stock-based awards (in shares) | 38,355 |  |  |  |
Stock-based compensation expense |  | 589 |  |  | 589
Shares of common stock withheld to pay taxes on employees' equity awards |  | (76) |  |  | (76)
Shares of common stock withheld to pay taxes on employees' equity awards (in shares) | (10,873) |  |  |  |
Stock dividend adjustments (in shares) | 11,444 |  |  |  |
Net income |  |  |  | $ 1,377 | 1,377
Balance at the end at Mar. 31, 2022 | $ 41 | 80,913 | (6,513) | 1,377 | 75,818
Balance at the end (in shares) at Mar. 31, 2022 | 39,776,816 |  |  |  |
Exercised and vested stock-based awards | $ 1 | 11 |  |  | 12
Exercised and vested stock-based awards (in shares) | 178,727 |  |  |  |
Stock-based compensation expense |  | 535 |  |  | 535
Shares of common stock withheld to pay taxes on employees' equity awards |  | (47) |  |  | (47)
Shares of common stock withheld to pay taxes on employees' equity awards (in shares) | (47,603) |  |  |  |
Purchase of treasury stock | $ (2) |  | (10,653) |  | (10,655)
Purchase of treasury stock (in shares) | (1,504,374) |  |  |  |
Net income |  |  |  | 3,346 | 3,346
Balance at the end at Jun. 30, 2022 | $ 40 | 81,412 | (17,166) | 4,723 | 69,009
Balance at the end (in shares) at Jun. 30, 2022 | 38,403,566 |  |  |  |
Balance at the beginning at Dec. 31, 2022 | $ 39 | 82,431 | (33,160) | 17,048 | 66,358
Balance at the beginning (in shares) at Dec. 31, 2022 | 36,825,081 |  |  |  |
Exercised and vested stock-based awards |  | 27 |  |  | 27
Exercised and vested stock-based awards (in shares) | 66,045 |  |  |  |
Stock-based compensation expense |  | 307 |  |  | 307
Warrants exercised (in shares) | 10,000 |  |  |  |
Shares of common stock withheld to pay taxes on employees' equity awards |  | (422) |  |  | (422)
Shares of common stock withheld to pay taxes on employees' equity awards (in shares) | (22,387) |  |  |  |
Purchase of treasury stock |  |  | (3,353) |  | (3,353)
Purchase of treasury stock (in shares) | (232,698) |  |  |  |
Net income |  |  |  | 1,569 | 1,569
Balance at the end at Mar. 31, 2023 | $ 39 | 82,343 | (36,513) | 18,617 | 64,486
Balance at the end (in shares) at Mar. 31, 2023 | 36,646,041 |  |  |  |
Exercised and vested stock-based awards |  | 9 |  |  | 9
Exercised and vested stock-based awards (in shares) | 45,626 |  |  |  |
Stock-based compensation expense |  | 660 |  |  | 660
Shares of common stock withheld to pay taxes on employees' equity awards | $ (3) | (124) |  |  | (127)
Shares of common stock withheld to pay taxes on employees' equity awards (in shares) | (11,224) |  |  |  |
Purchase of treasury stock |  |  | (6,115) |  | (6,115)
Purchase of treasury stock (in shares) | (666,200) |  |  |  |
Net income |  |  |  | 3,354 | 3,354
Balance at the end at Jun. 30, 2023 | $ 36 | $ 82,888 | $ (42,628) | $ 21,971 | $ 62,267
Balance at the end (in shares) at Jun. 30, 2023 | 36,014,243 |  |  |  |

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Namespace Prefix: | zyxi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Stock Issued During Period Shares Stock Warrants Exercised. + References No definition available. + Details
Name: | zyxi_StockIssuedDuringPeriodSharesStockWarrantsExercised
Namespace Prefix: | zyxi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Value of stock issued as a result of the exercise and vest of stock-based awards. + References No definition available. + Details
Name: | zyxi_StockIssuedDuringPeriodValueStockBasedAwardsExercisedAndVested
Namespace Prefix: | zyxi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration