Convertible Preferred Stock and Warrants - Summary of Preferred Stock (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Nov. 30, 2024	Sep. 30, 2023
Class of Stock [Line Items]
Preferred Stock Authorized	0	34,966,547
Preferred Stock Issued	0	17,228,954
Preferred Stock Outstanding	0	17,228,954
Carrying Value		$ 321,373
Liquidation Preference	$ 0	$ 355,162
Common Stock Issuable Upon Conversion		19,827,003
Series A Preferred Stock
Class of Stock [Line Items]
Preferred Stock Authorized		500,000
Preferred Stock Issued		253,807
Preferred Stock Outstanding		253,807
Carrying Value		$ 6,589
Liquidation Preference		$ 5,000
Common Stock Issuable Upon Conversion		317,040
Series A-2 Preferred Stock
Class of Stock [Line Items]
Preferred Stock Authorized		500,000
Preferred Stock Issued		253,807
Preferred Stock Outstanding		253,807
Carrying Value		$ 6,626
Liquidation Preference		$ 5,000
Common Stock Issuable Upon Conversion		317,040
Series B Preferred Stock
Class of Stock [Line Items]
Preferred Stock Authorized		4,197,930
Preferred Stock Issued		2,130,910
Preferred Stock Outstanding		2,130,910
Carrying Value		$ 61,606
Liquidation Preference		$ 63,053
Common Stock Issuable Upon Conversion		3,010,683
Series B-2 Preferred Stock
Class of Stock [Line Items]
Preferred Stock Authorized		3,960,000
Preferred Stock Issued		2,010,144
Preferred Stock Outstanding		2,010,144
Carrying Value		$ 63,228
Liquidation Preference		$ 63,360
Common Stock Issuable Upon Conversion		2,892,318
Series C Preferred Stock
Class of Stock [Line Items]
Preferred Stock Authorized		5,127,250
Preferred Stock Issued		2,082,153
Preferred Stock Outstanding		2,082,153
Carrying Value		$ 44,985
Liquidation Preference		$ 57,049
Common Stock Issuable Upon Conversion		2,791,789
Series D Preferred Stock
Class of Stock [Line Items]
Preferred Stock Authorized		12,107,140
Preferred Stock Issued		6,145,740		6,145,740
Preferred Stock Outstanding		6,145,740
Carrying Value		$ 78,679
Liquidation Preference		$ 101,700
Common Stock Issuable Upon Conversion		6,145,740
Series E Preferred Stock
Class of Stock [Line Items]
Preferred Stock Authorized		8,574,227
Preferred Stock Issued		4,352,393	4,352,393
Preferred Stock Outstanding		4,352,393
Carrying Value		$ 59,660
Liquidation Preference		$ 60,000
Common Stock Issuable Upon Conversion		4,352,393

Beta Bionics, Inc. 10-Q