Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 39,742	$ 38,635
Short term investments	8,637	20,534
Accounts receivable	1,055	5,810
Prepaid expenses and other current assets	11,071	8,445
Total current assets	60,505	73,424
Property and equipment, net	16,706	16,992
Operating lease right-of-use assets	3,796	3,705
Other non-current assets	1,251	1,369
Total assets	82,258	95,490
Current liabilities:
Accounts payable	5,833	4,154
Accrued expenses and other current liabilities	10,354	11,605
Deferred revenues, current portion	26,688	20,824
Total current liabilities	42,875	36,583
Deferred revenue, net of current portion	11,727	18,734
Operating lease liabilities	12,198	12,244
Total liabilities	66,800	67,561
Stockholders’ equity:
Preferred stock	0	0
Common stock	74	74
Additional paid-in capital	319,414	318,530
Accumulated other comprehensive loss	(426)	(254)
Accumulated deficit	(303,604)	(290,421)
Total stockholders’ equity	15,458	27,929
Total liabilities and stockholders’ equity	$ 82,258	$ 95,490

Amount of current portion of expenses incurred but not yet paid nor invoiced, and liabilities classified as other.

No definition available.

Name:	pirs_AccruedLiabilitiesAndOtherLiabilitiesCurrent
Namespace Prefix:	pirs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).