XML 33 R21.htm IDEA: XBRL DOCUMENT
v3.19.3

Short-Term Investments (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2019
Short-Term Investments |
Summary of short-term investments | The following table summarizes the short-term investments held at September 30, 2019 and December 31, 2018 (in thousands):
|  |  |  |  | Gross Unrealized |  | Gross Unrealized |  |  |
|  | Amortized Cost |  | Gains |  | Losses |  | Fair Value
September 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  | $ | 1,850 |  | $ | — |  | $ | — |  | $ | 1,850
Reverse repurchase agreements |  |  | 21,000 |  |  | — |  |  | — |  |  | 21,000
Total |  | $ | 22,850 |  | $ | — |  | $ | — |  | $ | 22,850
|  |  |  |  | Gross Unrealized |  | Gross Unrealized |  |  |
|  | Amortized Cost |  | Gains |  | Losses |  | Fair Value
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  | $ | 7,280 |  | $ | — |  | $ | (4) |  | $ | 7,276
Reverse repurchase agreements |  |  | 15,000 |  |  | — |  |  | — |  |  | 15,000
Total |  | $ | 22,280 |  | $ | — |  | $ | (4) |  | $ | 22,276

X
- Definition Tabular disclosure of short term investments securities. + References No definition available. + Details
Name: | catb_ScheduleOfShortTermInvestmentsTableTextBlock
Namespace Prefix: | catb_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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