XML 32 R12.htm IDEA: XBRL DOCUMENT
v3.21.2

Cash Equivalents and Marketable Securities | 9 Months Ended
--- | ---
Sep. 30, 2021
Cash Equivalents and Marketable Securities |
Cash Equivalents and Marketable Securities | Note 5. Cash Equivalents and Marketable Securities ​ Cash equivalents and marketable securities consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2021
​ | ​ | Amortized | ​ | Gross Unrealized | ​ |
​ |  | Cost |  | Gains |  | Losses |  | Fair Value
Money market funds | ​ | $ | 57,077 | ​ | $ | — | ​ | $ | — | ​ | $ | 57,077
Commercial paper | ​ |  | 161,315 | ​ | ​ | 2 | ​ | ​ | (5) | ​ |  | 161,312
Corporate debt securities | ​ | ​ | 81,413 | ​ | ​ | 1 | ​ | ​ | (22) | ​ | ​ | 81,392
U.S. Treasury and agency securities | ​ | ​ | 42,186 | ​ | ​ | 3 | ​ | ​ | (2) | ​ | ​ | 42,187
Supranational and sovereign government securities | ​ |  | 6,028 | ​ | ​ | — | ​ | ​ | — | ​ |  | 6,028
Total cash equivalents and marketable securities | ​ | $ | 348,019 | ​ | $ | 6 |  | $ | (29) | ​ | $ | 347,996
Classified as: | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
Cash equivalents | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | $ | 116,068
Marketable securities - current | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  |  | 193,759
Marketable securities - noncurrent | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  |  | 38,169
Total cash equivalents and marketable securities | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | $ | 347,996
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020
​ | ​ | Amortized | ​ | Gross Unrealized | ​ |
​ |  | Cost |  | Gains |  | Losses |  | Fair Value
Money market funds | ​ | $ | 27,481 | ​ | $ | — |  | $ | — | ​ | $ | 27,481
Commercial paper | ​ |  | 65,866 | ​ |  | — |  |  | (3) | ​ |  | 65,863
Corporate debt securities | ​ |  | 27,592 | ​ |  | 2 |  |  | (4) | ​ |  | 27,590
U.S. Treasury and agency securities | ​ |  | 183,203 | ​ |  | 10 |  |  | (3) | ​ |  | 183,210
Total cash equivalents and marketable securities | ​ | $ | 304,142 | ​ | $ | 12 |  | $ | (10) | ​ | $ | 304,144
Classified as: | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
Cash equivalents | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | $ | 113,693
Marketable securities - current | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  |  | 188,451
Marketable securities - noncurrent | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  |  | 2,000
Total cash equivalents and marketable securities | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | $ | 304,144
​ Marketable securities – current of $193.8 million and $188.5 million held at September 30, 2021 and December 31, 2020, respectively, had contractual maturities of less than one year. Marketable securities – noncurrent of $38.2 million and $2.0 million held at September 30, 2021 and December 31, 2020 had contractual maturities of at least one year but less than two years. The Company does not intend to sell its securities that are in an unrealized loss position, and it is not more likely than not that the Company will be required to sell its securities before recovery of their amortized cost basis, which may be at maturity. There were no realized gains or realized losses on marketable securities for the periods presented. Factors considered in determining whether a loss is temporary include the length of time and extent to which the fair value has been less than the amortized cost basis and whether the Company intends to sell the security or whether it is more likely than not that the Company would be required to sell the security before recovery of the amortized cost basis.

X
- Definition NA + References No definition available. + Details
Name: | ptgx_CashEquivalentsAndMarketableSecuritiesAbstract
Namespace Prefix: | ptgx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure of cash, cash equivalents, and debt and equity securities, including any unrealized or realized gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
Name: | us-gaap_CashCashEquivalentsAndMarketableSecuritiesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration