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CONSOLIDATED STATEMENT OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (Parenthetical) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) Class
Number of classes of common stock | Class	2
Common Stock
Underwriters' commissions and offering costs | $	$ 10,366

X

- Definition

The number of classes of common stock of the entity.

+ References

No definition available.

+ Details

Name:	ttd_CommonStockNumberOfClasses
Namespace Prefix:	ttd_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The aggregate amount of direct costs associated with issuing stock, plus underwriters' commissions and discounts.

+ References

No definition available.

+ Details

Name:	ttd_SaleOfStockIssuanceCostsAndUnderwritersCommissionsAndDiscounts
Namespace Prefix:	ttd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: