XML 38 R11.htm IDEA: XBRL DOCUMENT
v3.19.3

Short-Term Investments | 9 Months Ended
--- | ---
Sep. 30, 2019
Short-Term Investments |
Short-Term Investments | 4. 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
The contractual maturities of all short-term investments held at September 30, 2019 and December 31, 2018 were one year or less. There were seven short-term investments in an unrealized loss position at December 31, 2018, none of which had been in an unrealized loss position for more than 12 months. The aggregate fair value of these investments was approximately $7.3 million. There were no short-term investments in an unrealized loss position at September 30, 2019. The Company did not hold any investments with other-than-temporary impairments at September 30, 2019 and December 31, 2018. Gross realized gains and losses on the sales of short-term investments are included in other income, net. Unrealized holding gains or losses for the period that have been included in accumulated other comprehensive income, as well as gains and losses reclassified out of accumulated other comprehensive income into other income, net were not material to the Company’s condensed consolidated results of operations. The cost of investments sold or the amount reclassified out of the accumulated other comprehensive income into other income, net is based on the specific identification method for purposes of recording realized gains and losses. All proceeds in the three and nine-month periods ended September 30, 2019 and 2018 related to maturities of underlying investments. The gains on proceeds from maturities of short-term investments were not material to the Company’s condensed consolidated results of operations for the three or nine months ended September 30, 2019 and 2018.

X
- Definition The entire disclosure of the short-term investments. Short-term investments may include current marketable securities. + References No definition available. + Details
Name: | catb_ShortTermInvestmentsTextBlock
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