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Pay vs Performance Disclosure - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pay vs Performance Disclosure        
Pay vs Performance Disclosure, Table
​ ​
Year
​ ​ ​
Summary
Compensation
Table Total for
Chih-Hsiang
(Thompson)
Lin(1)
($)
​ ​ ​
Compensation
Actually Paid to
Chih-Hsiang
(Thompson)
Lin(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 $100
Investment based
on:(4)
​ ​ ​
Net Income
($ Thousands)
​ ​
​
TSR
($)
​ ​ ​
Peer Group
TSR
($)
​ ​
​ ​ 2023 ​ ​ ​ ​ ​ 6,049,470 ​ ​ ​ ​ ​ ​ 38,409,964 ​ ​ ​ ​ ​ ​ 1,923,067 ​ ​ ​ ​ ​ ​ 11,430,710 ​ ​ ​ ​ ​ ​ 162.63 ​ ​ ​ ​ ​ ​ 178.88 ​ ​ ​ ​ ​ ​ (56,048) ​ ​ ​
​ ​ 2022 ​ ​ ​ ​ ​ 2,157,067 ​ ​ ​ ​ ​ ​ 456,994 ​ ​ ​ ​ ​ ​ 811,490 ​ ​ ​ ​ ​ ​ 311,906 ​ ​ ​ ​ ​ ​ 15.91 ​ ​ ​ ​ ​ ​ 178.07 ​ ​ ​ ​ ​ ​ (66,397) ​ ​ ​
​ ​ 2021 ​ ​ ​ ​ ​ 3,659,008 ​ ​ ​ ​ ​ ​ 2,725,556 ​ ​ ​ ​ ​ ​ 1,251,466 ​ ​ ​ ​ ​ ​ 988,822 ​ ​ ​ ​ ​ ​ 43.27 ​ ​ ​ ​ ​ ​ 215.25 ​ ​ ​ ​ ​ ​ (54,162) ​ ​ ​
​ ​ 2020 ​ ​ ​ ​ ​ 2,476,271 ​ ​ ​ ​ ​ ​ 2,242,974 ​ ​ ​ ​ ​ ​ 899,965 ​ ​ ​ ​ ​ ​ 870,688 ​ ​ ​ ​ ​ ​ 71.63 ​ ​ ​ ​ ​ ​ 142.68 ​ ​ ​ ​ ​ ​ (58,452) ​ ​ ​
​
(1)
Chih-Hsiang (Thompson) Lin was our PEO for each year presented. The individuals comprising the Non-PEO NEOs for each year presented are listed below.
​
​ ​
2021 – 2023
​ ​
​ ​
Stefan J. Murry
​ ​
​ ​
Hung-Lun (Fred) Chang
​ ​
​ ​
Shu-Hua (Joshua) Yeh
​ ​
​ ​
David C. Kuo
​ ​
​
(2)
The amounts shown for Compensation Actually Paid have been calculated in accordance with Item 402(v) of Regulation S-K and do not reflect compensation actually earned, realized, or received by the Company’s NEOs. These amounts reflect the Summary Compensation Table Total with certain adjustments as described in footnote 3 below.
​
(3)
Compensation Actually Paid reflects the exclusions and inclusions of certain amounts for the PEO and the Non-PEO NEOs as set forth below. Equity values are calculated in accordance with FASB ASC Topic 718. Amounts in the Exclusion of Stock Awards column are the totals from the Stock Awards column set forth in the Summary Compensation Table.
​
​ ​
Year
​ ​ ​
Summary Compensation
Table Total for Chih-
Hsiang (Thompson) Lin
($)
​ ​ ​
Exclusion of Stock
Awards for Chih-Hsiang
(Thompson) Lin
($)
​ ​ ​
Inclusion of Equity
Values for Chih-Hsiang
(Thompson) Lin
($)
​ ​ ​
Compensation Actually
Paid to Chih-Hsiang
(Thompson) Lin
($)
​ ​
​ ​ 2023 ​ ​ ​ ​ ​ 6,049,470 ​ ​ ​ ​ ​ ​ (4,816,714) ​ ​ ​ ​ ​ ​ 37,177,208 ​ ​ ​ ​ ​ ​ 38,409,964 ​ ​ ​
​ ​ 2022 ​ ​ ​ ​ ​ 2,157,067 ​ ​ ​ ​ ​ ​ (949,776) ​ ​ ​ ​ ​ ​ (750,297) ​ ​ ​ ​ ​ ​ 456,994 ​ ​ ​
​ ​ 2021 ​ ​ ​ ​ ​ 3,659,008 ​ ​ ​ ​ ​ ​ (2,915,291) ​ ​ ​ ​ ​ ​ 1,981,839 ​ ​ ​ ​ ​ ​ 2,725,556 ​ ​ ​
​ ​ 2020 ​ ​ ​ ​ ​ 2,476,271 ​ ​ ​ ​ ​ ​ (1,595,332) ​ ​ ​ ​ ​ ​ 1,362,035 ​ ​ ​ ​ ​ ​ 2,242,974 ​ ​ ​
​ ​
Year
​ ​ ​
Average Summary
Compensation Table
Total for Non-PEO NEOs
($)
​ ​ ​
Average Exclusion of
Stock Awards for Non-
PEO NEOs
($)
​ ​ ​
Average Inclusion of
Equity Values for Non-
PEO NEOs
($)
​ ​ ​
Average Compensation
Actually Paid to Non-
PEO NEOs
($)
​ ​
​ ​ 2023 ​ ​ ​ ​ ​ 1,923,067 ​ ​ ​ ​ ​ ​ (1,390,823) ​ ​ ​ ​ ​ ​ 10,898,466 ​ ​ ​ ​ ​ ​ 11,430,710 ​ ​ ​
​ ​ 2022 ​ ​ ​ ​ ​ 811,490 ​ ​ ​ ​ ​ ​ (282,557) ​ ​ ​ ​ ​ ​ (217,027) ​ ​ ​ ​ ​ ​ 311,906 ​ ​ ​
​ ​ 2021 ​ ​ ​ ​ ​ 1,251,466 ​ ​ ​ ​ ​ ​ (867,292) ​ ​ ​ ​ ​ ​ 604,648 ​ ​ ​ ​ ​ ​ 988,822 ​ ​ ​
​ ​ 2020 ​ ​ ​ ​ ​ 899,965 ​ ​ ​ ​ ​ ​ (480,510) ​ ​ ​ ​ ​ ​ 451,233 ​ ​ ​ ​ ​ ​ 870,688 ​ ​ ​
The amounts in the Inclusion of Equity Values in the tables above are derived from the amounts set forth in the following tables:
​ ​
Year
​ ​ ​
Year-End Fair Value
of Equity Awards
Granted During
Year That Remained
Unvested as of Last
Day of Year for
Chih-Hsiang
(Thompson) Lin
($)
​ ​ ​
Change in Fair
Value from Last
Day of Prior Year to
Last Day of Year of
Unvested Equity
Awards for Chih-
Hsiang (Thompson)
Lin
($)
​ ​ ​
Vesting-Date Fair
Value of Equity
Awards Granted
During Year that
Vested During Year
for Chih-Hsiang
(Thompson) Lin
($)
​ ​ ​
Change in Fair
Value from Last
Day of Prior Year to
Vesting Date of
Unvested Equity
Awards
that Vested
During Year for
Chih-Hsiang
(Thompson) Lin
($)
​ ​ ​
Total – Inclusion of
Equity Values for
Chih-Hsiang
(Thompson) Lin
($)
​ ​
​ ​ 2023 ​ ​ ​ ​ ​ 19,272,269 ​ ​ ​ ​ ​ ​ 16,949,393 ​ ​ ​ ​ ​ ​ 433,047 ​ ​ ​ ​ ​ ​ 522,499 ​ ​ ​ ​ ​ ​ 37,177,208 ​ ​ ​
​ ​ 2022 ​ ​ ​ ​ ​ 971,794 ​ ​ ​ ​ ​ ​ (1,471,585) ​ ​ ​ ​ ​ ​ 88,308 ​ ​ ​ ​ ​ ​ (338,814) ​ ​ ​ ​ ​ ​ (750,297) ​ ​ ​
​ ​ 2021 ​ ​ ​ ​ ​ 2,106,831 ​ ​ ​ ​ ​ ​ (462,209) ​ ​ ​ ​ ​ ​ 331,884 ​ ​ ​ ​ ​ ​ 5,333 ​ ​ ​ ​ ​ ​ 1,981,839 ​ ​ ​
​ ​ 2020 ​ ​ ​ ​ ​ 1,291,035 ​ ​ ​ ​ ​ ​ (296,981) ​ ​ ​ ​ ​ ​ 383,351 ​ ​ ​ ​ ​ ​ (15,370) ​ ​ ​ ​ ​ ​ 1,362,035 ​ ​ ​
​ ​
Year
​ ​ ​
Average Year-End
Fair Value of Equity
Awards Granted
During Year That
Remained Unvested
as of Last Day of
Year for Non-PEO
NEOs
($)
​ ​ ​
Average Change in
Fair Value from
Last Day of Prior
Year to Last Day of
Year of Unvested
Equity Awards for
Non-PEO NEOs
($)
​ ​ ​
Average Vesting-
Date Fair Value of
Equity Awards
Granted During
Year that Vested
During Year for
Non-PEO NEOs
($)
​ ​ ​
Average Change in
Fair Value from
Last Day of Prior
Year to Vesting
Date of Unvested
Equity Awards that
Vested During Year
for Non-PEO NEOs
($)
​ ​ ​
Total – Average
Inclusion of
Equity Values for
Non-PEO NEOs
($)
​ ​
​ ​ 2023 ​ ​ ​ ​ ​ 5,570,051 ​ ​ ​ ​ ​ ​ 5,047,041 ​ ​ ​ ​ ​ ​ 125,040 ​ ​ ​ ​ ​ ​ 156,334 ​ ​ ​ ​ ​ ​ 10,898,466 ​ ​ ​
​ ​ 2022 ​ ​ ​ ​ ​ 289,108 ​ ​ ​ ​ ​ ​ (437,780) ​ ​ ​ ​ ​ ​ 26,271 ​ ​ ​ ​ ​ ​ (94,626) ​ ​ ​ ​ ​ ​ (217,027) ​ ​ ​
​ ​ 2021 ​ ​ ​ ​ ​ 629,586 ​ ​ ​ ​ ​ ​ (125,328) ​ ​ ​ ​ ​ ​ 99,736 ​ ​ ​ ​ ​ ​ 654 ​ ​ ​ ​ ​ ​ 604,648 ​ ​ ​
​ ​ 2020 ​ ​ ​ ​ ​ 390,003 ​ ​ ​ ​ ​ ​ (51,818) ​ ​ ​ ​ ​ ​ 115,801 ​ ​ ​ ​ ​ ​ (2,753) ​ ​ ​ ​ ​ ​ 451,233 ​ ​ ​
​
(4)
The Peer Group TSR set forth in this table utilizes the peer companies used for compensation benchmarking purposes in 2020, which are summarized in our “Compensation Discussion and Analysis” section of this Proxy Statement, for the years reflected in the table above but excludes companies that had ceased to be publicly traded as of the end of each fiscal year.
     
Named Executive Officers, Footnote
(1)
Chih-Hsiang (Thompson) Lin was our PEO for each year presented. The individuals comprising the Non-PEO NEOs for each year presented are listed below.
​
​ ​
2021 – 2023
​ ​
​ ​
Stefan J. Murry
​ ​
​ ​
Hung-Lun (Fred) Chang
​ ​
​ ​
Shu-Hua (Joshua) Yeh
​ ​
​ ​
David C. Kuo
​ ​
     
Peer Group Issuers, Footnote
(4)
The Peer Group TSR set forth in this table utilizes the peer companies used for compensation benchmarking purposes in 2020, which are summarized in our “Compensation Discussion and Analysis” section of this Proxy Statement, for the years reflected in the table above but excludes companies that had ceased to be publicly traded as of the end of each fiscal year.
     
PEO Total Compensation Amount $ 6,049,470 $ 2,157,067 $ 3,659,008 $ 2,476,271
PEO Actually Paid Compensation Amount $ 38,409,964 456,994 2,725,556 2,242,974
Adjustment To PEO Compensation, Footnote
(3)
Compensation Actually Paid reflects the exclusions and inclusions of certain amounts for the PEO and the Non-PEO NEOs as set forth below. Equity values are calculated in accordance with FASB ASC Topic 718. Amounts in the Exclusion of Stock Awards column are the totals from the Stock Awards column set forth in the Summary Compensation Table.
​
​ ​
Year
​ ​ ​
Summary Compensation
Table Total for Chih-
Hsiang (Thompson) Lin
($)
​ ​ ​
Exclusion of Stock
Awards for Chih-Hsiang
(Thompson) Lin
($)
​ ​ ​
Inclusion of Equity
Values for Chih-Hsiang
(Thompson) Lin
($)
​ ​ ​
Compensation Actually
Paid to Chih-Hsiang
(Thompson) Lin
($)
​ ​
​ ​ 2023 ​ ​ ​ ​ ​ 6,049,470 ​ ​ ​ ​ ​ ​ (4,816,714) ​ ​ ​ ​ ​ ​ 37,177,208 ​ ​ ​ ​ ​ ​ 38,409,964 ​ ​ ​
​ ​ 2022 ​ ​ ​ ​ ​ 2,157,067 ​ ​ ​ ​ ​ ​ (949,776) ​ ​ ​ ​ ​ ​ (750,297) ​ ​ ​ ​ ​ ​ 456,994 ​ ​ ​
​ ​ 2021 ​ ​ ​ ​ ​ 3,659,008 ​ ​ ​ ​ ​ ​ (2,915,291) ​ ​ ​ ​ ​ ​ 1,981,839 ​ ​ ​ ​ ​ ​ 2,725,556 ​ ​ ​
​ ​ 2020 ​ ​ ​ ​ ​ 2,476,271 ​ ​ ​ ​ ​ ​ (1,595,332) ​ ​ ​ ​ ​ ​ 1,362,035 ​ ​ ​ ​ ​ ​ 2,242,974 ​ ​ ​
The amounts in the Inclusion of Equity Values in the tables above are derived from the amounts set forth in the following tables:
​ ​
Year
​ ​ ​
Year-End Fair Value
of Equity Awards
Granted During
Year That Remained
Unvested as of Last
Day of Year for
Chih-Hsiang
(Thompson) Lin
($)
​ ​ ​
Change in Fair
Value from Last
Day of Prior Year to
Last Day of Year of
Unvested Equity
Awards for Chih-
Hsiang (Thompson)
Lin
($)
​ ​ ​
Vesting-Date Fair
Value of Equity
Awards Granted
During Year that
Vested During Year
for Chih-Hsiang
(Thompson) Lin
($)
​ ​ ​
Change in Fair
Value from Last
Day of Prior Year to
Vesting Date of
Unvested Equity
Awards
that Vested
During Year for
Chih-Hsiang
(Thompson) Lin
($)
​ ​ ​
Total – Inclusion of
Equity Values for
Chih-Hsiang
(Thompson) Lin
($)
​ ​
​ ​ 2023 ​ ​ ​ ​ ​ 19,272,269 ​ ​ ​ ​ ​ ​ 16,949,393 ​ ​ ​ ​ ​ ​ 433,047 ​ ​ ​ ​ ​ ​ 522,499 ​ ​ ​ ​ ​ ​ 37,177,208 ​ ​ ​
​ ​ 2022 ​ ​ ​ ​ ​ 971,794 ​ ​ ​ ​ ​ ​ (1,471,585) ​ ​ ​ ​ ​ ​ 88,308 ​ ​ ​ ​ ​ ​ (338,814) ​ ​ ​ ​ ​ ​ (750,297) ​ ​ ​
​ ​ 2021 ​ ​ ​ ​ ​ 2,106,831 ​ ​ ​ ​ ​ ​ (462,209) ​ ​ ​ ​ ​ ​ 331,884 ​ ​ ​ ​ ​ ​ 5,333 ​ ​ ​ ​ ​ ​ 1,981,839 ​ ​ ​
​ ​ 2020 ​ ​ ​ ​ ​ 1,291,035 ​ ​ ​ ​ ​ ​ (296,981) ​ ​ ​ ​ ​ ​ 383,351 ​ ​ ​ ​ ​ ​ (15,370) ​ ​ ​ ​ ​ ​ 1,362,035 ​ ​ ​
     
Non-PEO NEO Average Total Compensation Amount $ 1,923,067 811,490 1,251,466 899,965
Non-PEO NEO Average Compensation Actually Paid Amount $ 11,430,710 311,906 988,822 870,688
Adjustment to Non-PEO NEO Compensation Footnote
(3)
Compensation Actually Paid reflects the exclusions and inclusions of certain amounts for the PEO and the Non-PEO NEOs as set forth below. Equity values are calculated in accordance with FASB ASC Topic 718. Amounts in the Exclusion of Stock Awards column are the totals from the Stock Awards column set forth in the Summary Compensation Table.
​
​ ​
Year
​ ​ ​
Average Summary
Compensation Table
Total for Non-PEO NEOs
($)
​ ​ ​
Average Exclusion of
Stock Awards for Non-
PEO NEOs
($)
​ ​ ​
Average Inclusion of
Equity Values for Non-
PEO NEOs
($)
​ ​ ​
Average Compensation
Actually Paid to Non-
PEO NEOs
($)
​ ​
​ ​ 2023 ​ ​ ​ ​ ​ 1,923,067 ​ ​ ​ ​ ​ ​ (1,390,823) ​ ​ ​ ​ ​ ​ 10,898,466 ​ ​ ​ ​ ​ ​ 11,430,710 ​ ​ ​
​ ​ 2022 ​ ​ ​ ​ ​ 811,490 ​ ​ ​ ​ ​ ​ (282,557) ​ ​ ​ ​ ​ ​ (217,027) ​ ​ ​ ​ ​ ​ 311,906 ​ ​ ​
​ ​ 2021 ​ ​ ​ ​ ​ 1,251,466 ​ ​ ​ ​ ​ ​ (867,292) ​ ​ ​ ​ ​ ​ 604,648 ​ ​ ​ ​ ​ ​ 988,822 ​ ​ ​
​ ​ 2020 ​ ​ ​ ​ ​ 899,965 ​ ​ ​ ​ ​ ​ (480,510) ​ ​ ​ ​ ​ ​ 451,233 ​ ​ ​ ​ ​ ​ 870,688 ​ ​ ​
The amounts in the Inclusion of Equity Values in the tables above are derived from the amounts set forth in the following tables:
​ ​
Year
​ ​ ​
Average Year-End
Fair Value of Equity
Awards Granted
During Year That
Remained Unvested
as of Last Day of
Year for Non-PEO
NEOs
($)
​ ​ ​
Average Change in
Fair Value from
Last Day of Prior
Year to Last Day of
Year of Unvested
Equity Awards for
Non-PEO NEOs
($)
​ ​ ​
Average Vesting-
Date Fair Value of
Equity Awards
Granted During
Year that Vested
During Year for
Non-PEO NEOs
($)
​ ​ ​
Average Change in
Fair Value from
Last Day of Prior
Year to Vesting
Date of Unvested
Equity Awards that
Vested During Year
for Non-PEO NEOs
($)
​ ​ ​
Total – Average
Inclusion of
Equity Values for
Non-PEO NEOs
($)
​ ​
​ ​ 2023 ​ ​ ​ ​ ​ 5,570,051 ​ ​ ​ ​ ​ ​ 5,047,041 ​ ​ ​ ​ ​ ​ 125,040 ​ ​ ​ ​ ​ ​ 156,334 ​ ​ ​ ​ ​ ​ 10,898,466 ​ ​ ​
​ ​ 2022 ​ ​ ​ ​ ​ 289,108 ​ ​ ​ ​ ​ ​ (437,780) ​ ​ ​ ​ ​ ​ 26,271 ​ ​ ​ ​ ​ ​ (94,626) ​ ​ ​ ​ ​ ​ (217,027) ​ ​ ​
​ ​ 2021 ​ ​ ​ ​ ​ 629,586 ​ ​ ​ ​ ​ ​ (125,328) ​ ​ ​ ​ ​ ​ 99,736 ​ ​ ​ ​ ​ ​ 654 ​ ​ ​ ​ ​ ​ 604,648 ​ ​ ​
​ ​ 2020 ​ ​ ​ ​ ​ 390,003 ​ ​ ​ ​ ​ ​ (51,818) ​ ​ ​ ​ ​ ​ 115,801 ​ ​ ​ ​ ​ ​ (2,753) ​ ​ ​ ​ ​ ​ 451,233 ​ ​ ​
     
Compensation Actually Paid vs. Total Shareholder Return
[MISSING IMAGE: bc_tsr-pn.jpg]
     
Compensation Actually Paid vs. Net Income
[MISSING IMAGE: bc_netincome-pn.jpg]
     
Total Shareholder Return Vs Peer Group [MISSING IMAGE: bc_tsr-pn.jpg]      
Total Shareholder Return Amount $ 162.63 15.91 43.27 71.63
Peer Group Total Shareholder Return Amount 178.88 178.07 215.25 142.68
Net Income (Loss) $ (56,048,000) (66,397,000) (54,162,000) (58,452,000)
PEO Name Chih-Hsiang (Thompson) Lin      
PEO | Equity Awards Value In Summary Compensation Table (Grant Date Value) [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount $ (4,816,714) (949,776) (2,915,291) (1,595,332)
PEO | Total Equity Awards Adjustments [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 37,177,208 (750,297) 1,981,839 1,362,035
PEO | Year-end Fair Value Of Awards Granted In The Current Fiscal Year [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 19,272,269 971,794 2,106,831 1,291,035
PEO | Change In Fair Value Of Outstanding And Unvested Awards Granted In Prior Fiscal Years [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 16,949,393 (1,471,585) (462,209) (296,981)
PEO | Change In Fair Value As Of Vesting Date Of Current Year Awards Vested During Current Year [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 433,047 88,308 331,884 383,351
PEO | Change In Fair Value As Of Vesting Date Of Prior Year Awards Vested During Current Year [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 522,499 (338,814) 5,333 (15,370)
Non-PEO NEO | Equity Awards Value In Summary Compensation Table (Grant Date Value) [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount (1,390,823) (282,557) (867,292) (480,510)
Non-PEO NEO | Total Equity Awards Adjustments [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 10,898,466 (217,027) 604,648 451,233
Non-PEO NEO | Year-end Fair Value Of Awards Granted In The Current Fiscal Year [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 5,570,051 289,108 629,586 390,003
Non-PEO NEO | Change In Fair Value Of Outstanding And Unvested Awards Granted In Prior Fiscal Years [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 5,047,041 (437,780) (125,328) (51,818)
Non-PEO NEO | Change In Fair Value As Of Vesting Date Of Current Year Awards Vested During Current Year [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount 125,040 26,271 99,736 115,801
Non-PEO NEO | Change In Fair Value As Of Vesting Date Of Prior Year Awards Vested During Current Year [Member]        
Pay vs Performance Disclosure        
Adjustment to Compensation, Amount $ 156,334 $ (94,626) $ 654 $ (2,753)