Stockholders' Equity	12 Months Ended
Dec. 31, 2018
Equity [Abstract]
Stockholders' Equity	12. Stockholders’ Equity Tender Offer On May 10, 2016, the Company commenced a Tender Offer to purchase up to 8.0 million shares of its common stock, representing approximately 24.8% of the shares of TechTarget’s common stock issued and outstanding at that time, at a price of $7.75 per share. The Tender Offer expired on June 8, 2016. In accordance with the terms of the Tender Offer, the Company accepted for purchase 5,237,843 shares of its common stock for a purchase price of $7.75 per share, or a total of $40.6 million. Repurchased shares were recorded under the cost method and are reflected as treasury stock in the accompanying Consolidated Balance Sheets. The total cost of the Tender Offer was $40.8 million, which included approximately $0.2 million in costs directly attributable to the purchase of shares pursuant to the Tender Offer. In connection with the tender offer, TCV V, L.P., TCV Member Fund, L.P. (along with TCV V, L.P., referred to as the “TCV Funds”) and TCV Management 2004, L.L.C. (“TCM 2004”), each a related party, collectively tendered 3,379,249 shares of the Company’s common stock in the aggregate. Jay Hoag, a member of the Company’s Board of Directors at the time of the Tender Offer, was also a member of the general partner of the TCV Funds and a member of TCM 2004, which at the time was estimated to hold more than 5% of the voting securities of the Company. Additionally, Rogram LLC, a related party, tendered 308,713 shares in connection with the Tender Offer. Roger Marino, a member of the Company’s Board of Directors, indirectly controls shares in Rogram LLC. Common Stock Repurchase Programs On November 7, 2018 the Company announced the November 2018 Stock Repurchase plan to repurchase shares up to an aggregate amount of $25.0 million whereby the Company was authorized to repurchase the Company’s common stock from time to time on the open market or in privately negotiated transactions at prices and in a manner that may be determined by management. The Company repurchased 243,425 shares at an aggregate purchase price of $3.1 million at an average share price of $12.82 during the fourth quarter under the November 2018 Stock Repurchase plan. In June 2016, the Company announced that the Board had authorized a $20.0 million stock repurchase program (the “June 2016 Repurchase Program”) whereby the Company was authorized to repurchase the Company’s common stock from time to time on the open market or in privately negotiated transactions at prices and in the manner that may be determined by the Board. Pursuant to the June 2016 Repurchase Program, the Company repurchased 211,729, 749,437 and 980,329 shares of common stock for an aggregate purchase price of $3.9 million, $8.1 million and $8.0 million in 2018, 2017 and 2016 respectively. On May 5, 2017, the Board reauthorized the June 2016 Repurchase Program to allow the Company to use the remaining balance of the unused authorization under such program after its original expiration date in June 2017. For all or a portion of the authorized repurchase amount, the Company may enter into one or more plans that are compliant with Rule 10b5-1 of the Securities Exchange Act of 1934 that are designed to facilitate these purchases. In August 2018, the June 2016 Common Stock Repurchase plan expired. Repurchased shares are recorded under the cost method and are reflected as treasury stock in the accompanying Consolidated Balance Sheets. Reserved Common Stock As of December 31, 2018, the Company has reserved 3,334,912 shares of common stock for use in settling outstanding options and unvested restricted stock units that have not been issued, as well as future awards available for grant under the 2007 and 2017 Plans.

Stockholders' Equity

12 Months Ended

Dec. 31, 2018

12. Stockholders’ Equity

Tender Offer

On May 10, 2016, the Company commenced a Tender Offer to purchase up to 8.0 million shares of its common stock, representing approximately 24.8% of the shares of TechTarget’s common stock issued and outstanding at that time, at a price of $7.75 per share.

The Tender Offer expired on June 8, 2016. In accordance with the terms of the Tender Offer, the Company accepted for purchase 5,237,843 shares of its common stock for a purchase price of $7.75 per share, or a total of $40.6 million. Repurchased shares were recorded under the cost method and are reflected as treasury stock in the accompanying Consolidated Balance Sheets. The total cost of the Tender Offer was $40.8 million, which included approximately $0.2 million in costs directly attributable to the purchase of shares pursuant to the Tender Offer. In connection with the tender offer, TCV V, L.P., TCV Member Fund, L.P. (along with TCV V, L.P., referred to as the “TCV Funds”) and TCV Management 2004, L.L.C. (“TCM 2004”), each a related party, collectively tendered 3,379,249 shares of the Company’s common stock in the aggregate. Jay Hoag, a member of the Company’s Board of Directors at the time of the Tender Offer, was also a member of the general partner of the TCV Funds and a member of TCM 2004, which at the time was estimated to hold more than 5% of the voting securities of the Company. Additionally, Rogram LLC, a related party, tendered 308,713 shares in connection with the Tender Offer. Roger Marino, a member of the Company’s Board of Directors, indirectly controls shares in Rogram LLC.

Common Stock Repurchase Programs

On November 7, 2018 the Company announced the November 2018 Stock Repurchase plan to repurchase shares up to an aggregate amount of $25.0 million whereby the Company was authorized to repurchase the Company’s common stock from time to time on the open market or in privately negotiated transactions at prices and in a manner that may be determined by management. The Company repurchased 243,425 shares at an aggregate purchase price of $3.1 million at an average share price of $12.82 during the fourth quarter under the November 2018 Stock Repurchase plan.

In June 2016, the Company announced that the Board had authorized a $20.0 million stock repurchase program (the “June 2016 Repurchase Program”) whereby the Company was authorized to repurchase the Company’s common stock from time to time on the open market or in privately negotiated transactions at prices and in the manner that may be determined by the Board. Pursuant to the June 2016 Repurchase Program, the Company repurchased 211,729, 749,437 and 980,329 shares of common stock for an aggregate purchase price of $3.9 million, $8.1 million and $8.0 million in 2018, 2017 and 2016 respectively. On May 5, 2017, the Board reauthorized the June 2016 Repurchase Program to allow the Company to use the remaining balance of the unused authorization under such program after its original expiration date in June 2017. For all or a portion of the authorized repurchase amount, the Company may enter into one or more plans that are compliant with Rule 10b5-1 of the Securities Exchange Act of 1934 that are designed to facilitate these purchases. In August 2018, the June 2016 Common Stock Repurchase plan expired.

Repurchased shares are recorded under the cost method and are reflected as treasury stock in the accompanying Consolidated Balance Sheets.

Reserved Common Stock

As of December 31, 2018, the Company has reserved 3,334,912 shares of common stock for use in settling outstanding options and unvested restricted stock units that have not been issued, as well as future awards available for grant under the 2007 and 2017 Plans.