XML 27 R18.htm IDEA: XBRL DOCUMENT
v3.20.1

STATEMENTS OF CASH FLOWS DATA | 12 Months Ended
--- | ---
Dec. 31, 2019
Supplemental Cash Flow Elements [Abstract] |
STATEMENTS OF CASH FLOWS DATA | 10. STATEMENTS OF CASH FLOWS DATA
|  | Year Ended December 31, |
|  | 2019 |  |  | 2018 |  |  | 2017 |
|  | (In thousands) |
Supplemental investing activities: |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized gain (loss) on marketable securities |  | $ | 315 |  |  | $ | 24 |  |  | $ | (154 | )
Operating lease assets obtained in exchange for operating lease liabilities |  |  | 2,473 |  |  |  | — |  |  |  | — |
We have not made any cash payments for taxes or interest for the years ended December 31, 2019, 2018 and 2017.

X
- Definition The entire disclosure for supplemental cash flow activities, including cash, noncash, and part noncash transactions, for the period. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -URI http://asc.fasb.org/topic&trid=2134446 + Details
Name: | us-gaap_CashFlowSupplementalDisclosuresTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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