XML 32 R21.htm IDEA: XBRL DOCUMENT
v3.20.2

Cash and Cash Equivalents and Short-Term Investments (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2020
Cash and Cash Equivalents [Abstract] |
Summary of amortized cost, unrealized gain and loss and estimated fair value | The following tables summarize the amortized cost, unrealized gain and loss and estimated fair value of cash equivalents and short-term investments:
| June 30, 2020
(in thousands) | Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Estimated Fair Value
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 55,178 |  |  | $ | — |  |  | $ | — |  |  | $ | 55,178 |
Total cash equivalents | $ | 55,178 |  |  | $ | — |  |  | $ | — |  |  | $ | 55,178 |
Short-term investments: |  |  |  |  |  |  |
Commercial paper | $ | 48,573 |  |  | $ | — |  |  | $ | — |  |  | $ | 48,573 |
Corporate bonds | 11,769 |  |  | 56 |  |  | — |  |  | 11,825 |
U.S. Treasury and agency obligations | 45,143 |  |  | 93 |  |  | — |  |  | 45,236 |
Total short-term investments | $ | 105,485 |  |  | $ | 149 |  |  | $ | — |  |  | $ | 105,634 |
| December 31, 2019
(in thousands) | Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Estimated Fair Value
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 13,588 |  |  | $ | — |  |  | $ | — |  |  | $ | 13,588 |
Commercial paper | 8,987 |  |  | — |  |  | — |  |  | 8,987 |
Total cash equivalents | $ | 22,575 |  |  | $ | — |  |  | $ | — |  |  | $ | 22,575 |
Short-term investments: |  |  |  |  |  |  |
Commercial paper | $ | 61,371 |  |  | $ | — |  |  | $ | — |  |  | $ | 61,371 |
Corporate bonds | 23,856 |  |  | 14 |  |  | (1 | ) |  | 23,869 |
U.S. Treasury and agency obligations | 52,627 |  |  | 38 |  |  | (1 | ) |  | 52,664 |
Total short-term investments | $ | 137,854 |  |  | $ | 52 |  |  | $ | (2 | ) |  | $ | 137,904 |

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

X
- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration