Fair value portion of asset recognized for present right to economic benefit.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Fair Value Measurements - Summary of Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Recurring [Member]
Financial assets
Cash and cash equivalents	$ 10,708	$ 31,303	$ 21,762
Fair Value, Inputs, Level 1 [Member] \| Recurring [Member]
Financial assets
Cash and cash equivalents	10,708	31,303	21,762
Cara Therapeutics, Inc.
Financial assets
Available-for-sale marketable securities		0	48,983
Cara Therapeutics, Inc. \| Recurring [Member]
Financial assets
Total financial assets	34,217	37,903	102,666
Cara Therapeutics, Inc. \| U.S. Treasury Securities [Member]
Financial assets
Available-for-sale marketable securities			37,246
Cara Therapeutics, Inc. \| U.S. Treasury Securities [Member] \| Recurring [Member]
Financial assets
Available-for-sale marketable securities			37,246
Cara Therapeutics, Inc. \| U.S. Government Agency Obligations [Member]
Financial assets
Available-for-sale marketable securities			7,238
Cara Therapeutics, Inc. \| U.S. Government Agency Obligations [Member] \| Recurring [Member]
Financial assets
Available-for-sale marketable securities			7,238
Cara Therapeutics, Inc. \| Corporate Bonds [Member]
Financial assets
Available-for-sale marketable securities		0	4,499
Cara Therapeutics, Inc. \| Corporate Bonds [Member] \| Recurring [Member]
Financial assets
Available-for-sale marketable securities			4,499
Cara Therapeutics, Inc. \| Fair Value, Inputs, Level 1 [Member] \| Recurring [Member]
Financial assets
Total financial assets	34,217	37,903	53,683
Cara Therapeutics, Inc. \| Significant Other Observable Inputs (Level 2) [Member] \| Recurring [Member]
Financial assets
Total financial assets			48,983
Cara Therapeutics, Inc. \| Significant Other Observable Inputs (Level 2) [Member] \| U.S. Treasury Securities [Member] \| Recurring [Member]
Financial assets
Available-for-sale marketable securities			37,246
Cara Therapeutics, Inc. \| Significant Other Observable Inputs (Level 2) [Member] \| U.S. Government Agency Obligations [Member] \| Recurring [Member]
Financial assets
Available-for-sale marketable securities			7,238
Cara Therapeutics, Inc. \| Significant Other Observable Inputs (Level 2) [Member] \| Corporate Bonds [Member] \| Recurring [Member]
Financial assets
Available-for-sale marketable securities			4,499
Cara Therapeutics, Inc. \| Money Market Funds [Member] \| Recurring [Member]
Financial assets
Cash and cash equivalents	34,217	37,903	51,775
Restricted cash			1,908
Cara Therapeutics, Inc. \| Money Market Funds [Member] \| Fair Value, Inputs, Level 1 [Member] \| Recurring [Member]
Financial assets
Cash and cash equivalents	$ 34,217	$ 37,903	51,775
Restricted cash			$ 1,908