Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities:
Net loss	$ (71,767)	$ (128,911)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation expense	212	212
Stock-based compensation expense	13,368	15,497
Non-cash operating lease expense	407	366
Amortization of premiums and discounts on marketable securities, net	47	598
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	4,822	722
Accounts payable	(6,662)	1,041
Accrued expenses	(2,533)	(547)
Operating lease liabilities	(490)	(352)
Deferred revenue	(1,464)	0
Other	0	56
Net cash used in operating activities	(64,060)	(111,318)
Cash flows from investing activities:
Purchases of property and equipment	0	(399)
Purchases of marketable securities	0	(83,022)
Maturities of marketable securities	39,000	109,761
Net cash provided by investing activities	39,000	26,340
Cash flows from financing activities:
Payments of tax withholdings related to vesting of restricted stock units	(131)	(246)
Proceeds from exercise of stock options and employee stock purchase plan purchases	309	853
Net cash provided by financing activities	87,745	1,713
Increase (decrease) in cash, cash equivalents and restricted cash	62,685	(83,265)
Cash, cash equivalents and restricted cash, beginning of period	62,031	139,720
Cash, cash equivalents and restricted cash, end of period	124,716	56,455
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	124,300	56,039
Restricted cash	416	416
Total cash, cash equivalents and restricted cash	124,716	56,455
Supplemental disclosures of non-cash activities:
Offering costs included in accrued expenses	259	0
Follow-On Offering
Cash flows from financing activities:
Proceeds from stock offerings, net of issuance costs	63,439	0
At-The-Market Offering
Cash flows from financing activities:
Proceeds from stock offerings, net of issuance costs	24,128	1,368
Payment of issuance costs for at-the-market offerings	$ 0	$ (262)

Increase (Decrease) in Operating Lease Liabilities.

No definition available.

Name:	prax_IncreaseDecreaseInOperatingLeaseLiabilities
Namespace Prefix:	prax_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.