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Pay vs Performance Disclosure - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Pay vs Performance Disclosure    
Pay vs Performance Disclosure, Table
Pay Versus Performance Disclosure
​
As required by Item 402(v) of SEC Regulation S-K, the following table, footnotes and discussion provide “Pay versus Performance” regarding the relationship between executive compensation actually paid (“CAP”), as calculated under the applicable SEC rules, for the last two (2) fiscal years. As required by SEC rules, as it applies to smaller reporting companies, the table presented below discloses CAP for (i) our principal executive officer (“PEO”) and (ii) our NEOs other than the PEO (the “non-PEO NEOs”), on an average basis. The information provided below was not considered by our compensation committee in structuring or determining compensation for our NEOs.
Year
​ ​
Summary
Compensation
Table Total
for PEO
($)(1)
​ ​
Compensation
Actually
Paid to PEO
($)(1)(2)(3)
​ ​
Average
Summary
Compensation
Table Total for
Non-PEO
NEOs
($)(1)
​ ​
Average
Compensation
Actually
Paid to
Non-PEO
NEOs
($)(1)(2)(3)
​ ​
Value of
Initial
Fixed $100
Investment
Based on Total
Shareholder
Return
($)(4)
​ ​
Net Income
(Loss) (000)
($)
​
2024 ​ ​ ​ ​ 1,510,939 ​ ​ ​ ​ ​ 1,138,511 ​ ​ ​ ​ ​ 876,458 ​ ​ ​ ​ ​ 734,323 ​ ​ ​ ​ ​ 55 ​ ​ ​ ​ ​ (55,654) ​ ​
2023 ​ ​ ​ ​ 1,044,627 ​ ​ ​ ​ ​ 885,071 ​ ​ ​ ​ ​ 689,758 ​ ​ ​ ​ ​ 619,815 ​ ​ ​ ​ ​ 81 ​ ​ ​ ​ ​ (62,723) ​ ​
​
(1)
For 2024, Michael Richman was our PEO and our non-PEO NEOs were Timothy Mayer, Han Myint and Solomon Langermann. For 2023, Michael Richman was our PEO and our non-PEO NEOs were Han Myint and Solomon Langermann.
​
(2)
Amounts shown for CAP are computed in accordance with Item 402(v) of Regulation S-K and do not reflect the actual amount of compensation earned by or paid to the non-PEO NEOs during the applicable year. These amounts reflect total compensation as reported in the Summary Compensation Table with certain adjustments as described below:
​
​ ​ ​
PEO
​ ​
Non PEO’s
​
​ ​ ​
2023
​ ​
2024
​ ​
2023
​ ​
2024
​
Calculation of Compensation “Actually Paid” ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Summary compensation table total ​ ​ ​ ​ 1,044,627 ​ ​ ​ ​ ​ 1,510,939 ​ ​ ​ ​ ​ 689,758 ​ ​ ​ ​ ​ 876,458 ​ ​
Less grant date fair value of stock awards ​ ​ ​ ​ (346,238) ​ ​ ​ ​ ​ (658,240) ​ ​ ​ ​ ​ (151,269) ​ ​ ​ ​ ​ (252,900) ​ ​
Add year end fair value of awards granted during the fiscal year that are outstanding and unvested as of the end of the fiscal year
​ ​ ​ ​ 228,351 ​ ​ ​ ​ ​ 272,801 ​ ​ ​ ​ ​ 99,765 ​ ​ ​ ​ ​ 104,812 ​ ​
Change in fair value as of vesting date compared to prior year fair value for vested awards granted in prior years
​ ​ ​ ​ 7,271 ​ ​ ​ ​ ​ 75,831 ​ ​ ​ ​ ​ 3,413 ​ ​ ​ ​ ​ 33,450 ​ ​
Change in fair value as of fiscal year end compared to prior year
end fair value for unvested and outstanding awards granted in
prior fiscal year
​ ​ ​ ​ (48,940) ​ ​ ​ ​ ​ (62,820) ​ ​ ​ ​ ​ (21,852) ​ ​ ​ ​ ​ (27,497) ​ ​
Compensation “Actually Paid” ​ ​ ​ ​ 885,071 ​ ​ ​ ​ ​ 1,138,511 ​ ​ ​ ​ ​ 619,815 ​ ​ ​ ​ ​ 734,323 ​ ​
​
(3)
CAP reflects the exclusions and inclusions of equity awards for the PEO and the non-PEO NEOs as set forth above and calculated in accordance with FASB ASC Topic 718 as of the applicable measurement date. The valuation methodologies and assumptions used to calculate CAP are based on the same valuation and assumptions used for financial reporting purposes to calculate the grant date fair value of these awards, as disclosed in the Company’s audited financial statements for the years reflected in the table above.
​
(4)
Total Shareholder Return shown in this table assumes $100 was invested for the period starting December 31, 2022 through December 31 of the applicable fiscal year in the Company’s common stock as traded under ticker NXTC on Nasdaq. The historical stock price performance of our common stock shown is not necessarily indicative of future stock price performance.
 
Named Executive Officers, Footnote
(1)
For 2024, Michael Richman was our PEO and our non-PEO NEOs were Timothy Mayer, Han Myint and Solomon Langermann. For 2023, Michael Richman was our PEO and our non-PEO NEOs were Han Myint and Solomon Langermann.
 
PEO Total Compensation Amount $ 1,510,939 $ 1,044,627
PEO Actually Paid Compensation Amount $ 1,138,511 885,071
Adjustment To PEO Compensation, Footnote
(2)
Amounts shown for CAP are computed in accordance with Item 402(v) of Regulation S-K and do not reflect the actual amount of compensation earned by or paid to the non-PEO NEOs during the applicable year. These amounts reflect total compensation as reported in the Summary Compensation Table with certain adjustments as described below:
​
​ ​ ​
PEO
​ ​
Non PEO’s
​
​ ​ ​
2023
​ ​
2024
​ ​
2023
​ ​
2024
​
Calculation of Compensation “Actually Paid” ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Summary compensation table total ​ ​ ​ ​ 1,044,627 ​ ​ ​ ​ ​ 1,510,939 ​ ​ ​ ​ ​ 689,758 ​ ​ ​ ​ ​ 876,458 ​ ​
Less grant date fair value of stock awards ​ ​ ​ ​ (346,238) ​ ​ ​ ​ ​ (658,240) ​ ​ ​ ​ ​ (151,269) ​ ​ ​ ​ ​ (252,900) ​ ​
Add year end fair value of awards granted during the fiscal year that are outstanding and unvested as of the end of the fiscal year
​ ​ ​ ​ 228,351 ​ ​ ​ ​ ​ 272,801 ​ ​ ​ ​ ​ 99,765 ​ ​ ​ ​ ​ 104,812 ​ ​
Change in fair value as of vesting date compared to prior year fair value for vested awards granted in prior years
​ ​ ​ ​ 7,271 ​ ​ ​ ​ ​ 75,831 ​ ​ ​ ​ ​ 3,413 ​ ​ ​ ​ ​ 33,450 ​ ​
Change in fair value as of fiscal year end compared to prior year
end fair value for unvested and outstanding awards granted in
prior fiscal year
​ ​ ​ ​ (48,940) ​ ​ ​ ​ ​ (62,820) ​ ​ ​ ​ ​ (21,852) ​ ​ ​ ​ ​ (27,497) ​ ​
Compensation “Actually Paid” ​ ​ ​ ​ 885,071 ​ ​ ​ ​ ​ 1,138,511 ​ ​ ​ ​ ​ 619,815 ​ ​ ​ ​ ​ 734,323 ​ ​
 
Non-PEO NEO Average Total Compensation Amount $ 876,458 689,758
Non-PEO NEO Average Compensation Actually Paid Amount $ 734,323 619,815
Adjustment to Non-PEO NEO Compensation Footnote
(2)
Amounts shown for CAP are computed in accordance with Item 402(v) of Regulation S-K and do not reflect the actual amount of compensation earned by or paid to the non-PEO NEOs during the applicable year. These amounts reflect total compensation as reported in the Summary Compensation Table with certain adjustments as described below:
​
​ ​ ​
PEO
​ ​
Non PEO’s
​
​ ​ ​
2023
​ ​
2024
​ ​
2023
​ ​
2024
​
Calculation of Compensation “Actually Paid” ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Summary compensation table total ​ ​ ​ ​ 1,044,627 ​ ​ ​ ​ ​ 1,510,939 ​ ​ ​ ​ ​ 689,758 ​ ​ ​ ​ ​ 876,458 ​ ​
Less grant date fair value of stock awards ​ ​ ​ ​ (346,238) ​ ​ ​ ​ ​ (658,240) ​ ​ ​ ​ ​ (151,269) ​ ​ ​ ​ ​ (252,900) ​ ​
Add year end fair value of awards granted during the fiscal year that are outstanding and unvested as of the end of the fiscal year
​ ​ ​ ​ 228,351 ​ ​ ​ ​ ​ 272,801 ​ ​ ​ ​ ​ 99,765 ​ ​ ​ ​ ​ 104,812 ​ ​
Change in fair value as of vesting date compared to prior year fair value for vested awards granted in prior years
​ ​ ​ ​ 7,271 ​ ​ ​ ​ ​ 75,831 ​ ​ ​ ​ ​ 3,413 ​ ​ ​ ​ ​ 33,450 ​ ​
Change in fair value as of fiscal year end compared to prior year
end fair value for unvested and outstanding awards granted in
prior fiscal year
​ ​ ​ ​ (48,940) ​ ​ ​ ​ ​ (62,820) ​ ​ ​ ​ ​ (21,852) ​ ​ ​ ​ ​ (27,497) ​ ​
Compensation “Actually Paid” ​ ​ ​ ​ 885,071 ​ ​ ​ ​ ​ 1,138,511 ​ ​ ​ ​ ​ 619,815 ​ ​ ​ ​ ​ 734,323 ​ ​
 
Compensation Actually Paid vs. Total Shareholder Return
[MISSING IMAGE: bc_actualpaidvstsr-4c.jpg]
 
Compensation Actually Paid vs. Net Income
[MISSING IMAGE: bc_actualpaidvsnetloss-4c.jpg]
 
Total Shareholder Return Amount $ 55 81
Net Income (Loss) $ (55,654,000) (62,723,000)
PEO Name Michael Richman  
PEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table    
Pay vs Performance Disclosure    
Adjustment to Compensation, Amount $ (658,240) (346,238)
PEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested    
Pay vs Performance Disclosure    
Adjustment to Compensation, Amount 272,801 228,351
PEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested    
Pay vs Performance Disclosure    
Adjustment to Compensation, Amount (62,820) (48,940)
PEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year    
Pay vs Performance Disclosure    
Adjustment to Compensation, Amount 75,831 7,271
Non-PEO NEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table    
Pay vs Performance Disclosure    
Adjustment to Compensation, Amount (252,900) (151,269)
Non-PEO NEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested    
Pay vs Performance Disclosure    
Adjustment to Compensation, Amount 104,812 99,765
Non-PEO NEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested    
Pay vs Performance Disclosure    
Adjustment to Compensation, Amount (27,497) (21,852)
Non-PEO NEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year    
Pay vs Performance Disclosure    
Adjustment to Compensation, Amount $ 33,450 $ 3,413