Summary of Significant Accounting Policies - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract]
Adjusted Cost	$ 31,221	$ 38,058
Fair Value	31,226	38,082
Unrealized Gains	7	25
Unrealized Losses	2	1
Recurring [Member]
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract]
Cash and Cash Equivalents	17,293	23,296
Investments Available for Sale	13,933	14,786
Cash [Member]
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract]
Adjusted Cost	3,759	1,777
Fair Value	3,759	1,777
Cash [Member] \| Recurring [Member]
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract]
Cash and Cash Equivalents	3,759	1,777
Mutual Funds [Member]
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract]
Adjusted Cost	12,038	20,077
Fair Value	12,038	20,077
Unrealized Gains	0	0
Unrealized Losses	0	0
Mutual Funds [Member] \| Recurring [Member] \| Level 1 [Member]
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract]
Cash and Cash Equivalents	12,038	20,077
Investments Available for Sale	0	0
U.S. Agency and Treasury Securities [Member]
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract]
Adjusted Cost	15,424	16,204
Fair Value	15,429	16,228
Unrealized Gains	7	25
Unrealized Losses	2	1
U.S. Agency and Treasury Securities [Member] \| Recurring [Member] \| Level 1 [Member]
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract]
Cash and Cash Equivalents	1,496	1,442
Investments Available for Sale	13,933	14,786
Total Investment Securities [Member]
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract]
Adjusted Cost	27,462	36,281
Fair Value	27,467	36,305
Unrealized Gains	7	25
Unrealized Losses	2	1
Total Investment Securities [Member] \| Recurring [Member] \| Level 1 [Member]
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract]
Cash and Cash Equivalents	13,534	21,519
Investments Available for Sale	$ 13,933	$ 14,786

VirnetX Holding Corp 10-Q