Quarterly report pursuant to Section 13 or 15(d)

Cover Page

Cover Page - shares
3 Months Ended
Mar. 31, 2021
May 12, 2021
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2021  
Document Transition Report false  
Entity File Number 001-37471  
Entity Incorporation, State or Country Code NV  
Entity Tax Identification Number 30-0784346  
Entity Address, Address Line One 255 State Street  
Entity Address, Address Line Two 9th Floor  
Entity Address, City or Town Boston,  
Entity Address, State or Province MA  
Entity Address, Country US  
Entity Address, Postal Zip Code 02109  
City Area Code 857  
Local Phone Number 246-8998  
Title of 12(b) Security Common Stock, $0.001 par value per share  
Trading Symbol PIRS  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   63,303,219
Amendment Flag false  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q1  
Entity Central Index Key 0001583648  
Current Fiscal Year End Date --12-31