Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 48,423	$ 117,764
Short term investments	21,400	0
Accounts receivable	829	3,313
Prepaid expenses and other current assets	7,908	6,548
Total current assets	78,560	127,625
Property and equipment, net	15,897	19,122
Operating lease right-of-use assets	3,399	3,909
Other non-current assets	1,307	2,904
Total assets	99,163	153,560
Current liabilities:
Accounts payable	3,641	8,609
Accrued expenses and other current liabilities	11,382	16,836
Deferred revenues, current portion	18,498	25,116
Total current liabilities	33,521	50,561
Deferred revenue, net of current portion	18,484	38,403
Operating lease liabilities	11,391	13,841
Total liabilities	63,396	102,805
Stockholders’ equity:
Preferred stock	0	0
Common stock	74	72
Additional paid-in capital	317,488	306,998
Accumulated other comprehensive income	524	829
Accumulated deficit	(282,319)	(257,144)
Total stockholders’ equity	35,767	50,755
Total liabilities and stockholders’ equity	$ 99,163	$ 153,560

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).