XML 49 R29.htm IDEA: XBRL DOCUMENT
v3.21.2

Cash Equivalents and Marketable Securities (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2021
Cash Equivalents and Marketable Securities |
Schedule of 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

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 Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
Name: | us-gaap_MarketableSecuritiesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration