XML 42 R29.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Preferred and Common Stock Warrants (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2018
Redeemable Convertible Preferred Stock Warrants |
Assumptions Used to Calculate Fair Value of Outstanding Warrants | The following assumptions were used to calculate the estimated fair value of the then-outstanding warrants until the closing date of the Company’s IPO and as of December 31, 2017 and 2016:
|  | 2017 |  | 2016
Dividend yield |  | 0 | % |  | 0 | %
Expected term (in years) |  | 2.75 |  |  | 0.50 - 3.75 |
Risk-free interest rates |  | 1.8 | % |  | 1.0% - 1.6% |
Expected volatility |  | 34.6 | % |  | 34.8% - 39.2% |

X
- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique used to measure similar asset in prior period by class of asset or liability on non-recurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueAssetsMeasuredOnNonrecurringBasisValuationTechniquesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=upwk_RedeemableConvertiblePreferredStockWarrantsTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |