XML 51 R31.htm IDEA: XBRL DOCUMENT
v3.21.2

Leases (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2021
Leases |
Schedule of balance sheet information | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | December 31,
Operating Leases: | ​ | 2021 | ​ | 2020
Operating lease right-of-use asset | ​ | $ | 5,371 | ​ | $ | 4,950
​ | ​ | ​ | ​ | ​ | ​ | ​
Operating lease liability - current | ​ | $ | 2,027 | ​ | $ | 1,459
Operating lease liability - noncurrent | ​ | ​ | 4,238 | ​ | ​ | 4,500
Total operating lease liabilities | ​ | $ | 6,265 | ​ | $ | 5,959
​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average remaining lease term (years) | ​ | ​ | 2.7 | ​ | ​ | 3.4
Weighted-average discount rate | ​ | ​ | 9.6% | ​ | ​ | 11.0%
Schedule of lease cost information | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended September 30,
​ |  | 2021 | ​ | 2020
Operating lease cost | ​ | $ | 1,378 | ​ | $ | 1,331
Less: sublease income | ​ | ​ | (68) | ​ | ​ | (22)
Total lease expense | ​ | $ | 1,310 | ​ | $ | 1,309
Schedule of cash flow information | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended September 30,
​ |  | 2021 | ​ | 2020
​ | ​ | ​ | ​ | ​ | ​ | ​
Operating cash flow used by operating leases | ​ | $ | 1,493 | ​ | $ | 1,450
New operating lease asset obtained in exchange for operating lease liability | ​ | $ | 1,373 | ​ | $ | -
Schedule of minimum lease payments and lease liabilities | ​
​ | ​ | ​ | ​
Year Ending December 31: |  | Amount
Remainder of 2021 | ​ | $ | 556
2022 | ​ | ​ | 2,660
2023 | ​ | ​ | 2,744
2024 | ​ | ​ | 1,160
2025 | ​ | ​ | —
Thereafter | ​ |  | —
Total future minimum lease payments | ​ | ​ | 7,120
Less: imputed interest | ​ | ​ | (855)
Present value of lease liabilities | ​ | $ | 6,265

X
- Definition The tabular disclosure of lease balance sheet. + References No definition available. + Details
Name: | ptgx_LeaseBalanceSheetDisclosureTableTextBlock
Namespace Prefix: | ptgx_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition The tabular disclosure of lease cash flow information. + References No definition available. + Details
Name: | ptgx_LeaseCashFlowInformationDisclosureTableTextBlock
Namespace Prefix: | ptgx_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
Name: | us-gaap_LeaseCostTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration