Fair Value Measurements and Other Long-term Investments	6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements and Other Long-term Investments	Fair Value Measurements and Other Long-term Investments Fair Value Measurements Money Market Accounts Cash equivalents include money market accounts which are classified as a level 1 measurement based on quoted prices in active markets for identical assets that the Company can access at the measurement date. During the second quarter of 2018, the Company liquidated its position in money market accounts, and converted the balance to cash. As a result, there are no money market accounts included in cash and cash equivalents as of June 30, 2018. The total amount of money market accounts included in cash and cash equivalents was $55.8 million as of December 31, 2017. Other Fair Value Measurements Cash, accounts receivable, restricted cash, accounts payable, accrued expenses and deferred revenue carrying amounts approximate fair value because of the short-term nature of these instruments. The Company’s non-financial assets, which include property and equipment, intangible assets and goodwill, are not required to be measured at fair value on a recurring basis. However, if certain triggering events occur, or if an annual impairment test is required and the Company is required to evaluate the non-financial asset for impairment, a resulting asset impairment would require that non-financial assets be recorded at fair value. Other Long-term Investments Long-term Lending Facility and Note Receivable On October 20, 2016, the Company entered into a multi-part transaction with SilverHub Media Limited (“SHM”), an unrelated third-party contributor. The transaction included three primary components: (a) a revolving credit facility pursuant to which the Company would be obligated to lend up to $4.6 million under certain conditions, (the “Facility”) to SHM. The Facility has a term of five years and requires SHM to make quarterly payments of principal to the Company beginning on the fourth anniversary of the Facility. The Facility bears interest at 10.0%, with all interest payments deferred until maturity, and the entire unpaid balance of principal and accrued interest due upon maturity; (b) a distribution agreement, under which the Company is the exclusive distributor of SHM’s content in certain markets subject to certain limitations; and (c) an option to acquire SHM at any time after the third anniversary of the Facility or to match any third-party acquisition offer with respect to SHM at any time until the fifth anniversary of the Facility. On March 27, 2017, the Facility was amended to reduce the maximum lending amount to approximately $3.3 million. As of June 30, 2018, SHM has borrowed $3.3 million under the Facility and the Company has no additional lending obligation. Simultaneously with the reduction of the maximum lending amount of the Facility, the Company invested $1.6 million in a convertible note issued by the SHM, which matures on October 20, 2021. The convertible note bears interest at 10.0%, with all interest payments deferred until maturity, and the entire unpaid balance of principal and accrued interest due upon maturity. The principal amount of the convertible note and any accrued and unpaid interest may be converted into equity of the Transaction Party at the Company’s option on the maturity date, or earlier upon certain events. In June 2018, SHM breached certain provisions of the distribution agreement, which constituted an event of default under the Facility. As a result of the occurrence of one or more events of default, the Company provided notice to SHM to demand immediate payment of all outstanding borrowings under the Facility and the convertible note, including accrued interest. SHM was unable to pay the outstanding borrowings and accrued interest and therefore, an administrator was appointed and SHM entered into United Kingdom administration (bankruptcy) proceedings. The Company has determined that its investments in SHM, including the Facility, the convertible note, accrued interest and a minor equity investment, are other-than-temporarily impaired and has recorded a $5.9 million impairment charge during the three months ended June 30, 2018 in order to reduce the fair value of the Company’s investment in SHM to zero. This charge was recorded in “Other (expense)/income, net” in the consolidated statements of operations. The investment was previously reported within “Other assets” on the consolidated balance sheet. Investment in ZCool Technologies Limited (“ZCool”) On January 4, 2018, the Company invested $15.0 million in convertible preferred shares issued by ZCool (the “Preferred Shares”), which is equivalent to a 25% fully diluted equity ownership interest. ZCool’s primary business is the operation of an e-commerce platform in China whereby customers can pay to license content contributed by creative professionals. ZCool has been the exclusive distributor of Shutterstock creative content in China since 2014. ZCool is a variable interest entity that is not consolidated because the Company is not the primary beneficiary. The Preferred Shares are not deemed to be in-substance common stock and will be accounted for using the measurement alternative for equity investments with no readily determinable fair value. The Preferred Shares will be reported at cost, adjusted for impairments or any observable price changes in ordinary transactions with identical or similar investments issued by ZCool. As of June 30, 2018, the Company’s total investment in ZCool is approximately $15.0 million, which is reported in other non-current assets.

Fair Value Measurements and Other Long-term Investments

Fair Value Measurements

Money Market Accounts

Cash equivalents include money market accounts which are classified as a level 1 measurement based on quoted prices in active markets for identical assets that the Company can access at the measurement date. During the second quarter of 2018, the Company liquidated its position in money market accounts, and converted the balance to cash. As a result, there are no money market accounts included in cash and cash equivalents as of June 30, 2018. The total amount of money market accounts included in cash and cash equivalents was $55.8 million as of December 31, 2017.

Other Fair Value Measurements

Cash, accounts receivable, restricted cash, accounts payable, accrued expenses and deferred revenue carrying amounts approximate fair value because of the short-term nature of these instruments. The Company’s non-financial assets, which include property and equipment, intangible assets and goodwill, are not required to be measured at fair value on a recurring basis. However, if certain triggering events occur, or if an annual impairment test is required and the Company is required to evaluate the non-financial asset for impairment, a resulting asset impairment would require that non-financial assets be recorded at fair value.

Other Long-term Investments

Long-term Lending Facility and Note Receivable

On October 20, 2016, the Company entered into a multi-part transaction with SilverHub Media Limited (“SHM”), an unrelated third-party contributor. The transaction included three primary components: (a) a revolving credit facility pursuant to which the Company would be obligated to lend up to $4.6 million under certain conditions, (the “Facility”) to SHM. The Facility has a term of five years and requires SHM to make quarterly payments of principal to the Company beginning on the fourth anniversary of the Facility. The Facility bears interest at 10.0%, with all interest payments deferred until maturity, and the entire unpaid balance of principal and accrued interest due upon maturity; (b) a distribution agreement, under which the Company is the exclusive distributor of SHM’s content in certain markets subject to certain limitations; and (c) an option to acquire SHM at any time after the third anniversary of the Facility or to match any third-party acquisition offer with respect to SHM at any time until the fifth anniversary of the Facility.

On March 27, 2017, the Facility was amended to reduce the maximum lending amount to approximately $3.3 million. As of June 30, 2018, SHM has borrowed $3.3 million under the Facility and the Company has no additional lending obligation.

Simultaneously with the reduction of the maximum lending amount of the Facility, the Company invested $1.6 million in a convertible note issued by the SHM, which matures on October 20, 2021. The convertible note bears interest at 10.0%, with all interest payments deferred until maturity, and the entire unpaid balance of principal and accrued interest due upon maturity. The principal amount of the convertible note and any accrued and unpaid interest may be converted into equity of the Transaction Party at the Company’s option on the maturity date, or earlier upon certain events.

In June 2018, SHM breached certain provisions of the distribution agreement, which constituted an event of default under the Facility. As a result of the occurrence of one or more events of default, the Company provided notice to SHM to demand immediate payment of all outstanding borrowings under the Facility and the convertible note, including accrued interest. SHM was unable to pay the outstanding borrowings and accrued interest and therefore, an administrator was appointed and SHM entered into United Kingdom administration (bankruptcy) proceedings. The Company has determined that its investments in SHM, including the Facility, the convertible note, accrued interest and a minor equity investment, are other-than-temporarily impaired and has recorded a $5.9 million impairment charge during the three months ended June 30, 2018 in order to reduce the fair value of the Company’s investment in SHM to zero. This charge was recorded in “Other (expense)/income, net” in the consolidated statements of operations. The investment was previously reported within “Other assets” on the consolidated balance sheet.

Investment in ZCool Technologies Limited (“ZCool”)

On January 4, 2018, the Company invested $15.0 million in convertible preferred shares issued by ZCool (the “Preferred Shares”), which is equivalent to a 25% fully diluted equity ownership interest. ZCool’s primary business is the operation of an e-commerce platform in China whereby customers can pay to license content contributed by creative professionals. ZCool has been the exclusive distributor of Shutterstock creative content in China since 2014.

ZCool is a variable interest entity that is not consolidated because the Company is not the primary beneficiary. The Preferred Shares are not deemed to be in-substance common stock and will be accounted for using the measurement alternative for equity investments with no readily determinable fair value. The Preferred Shares will be reported at cost, adjusted for impairments or any observable price changes in ordinary transactions with identical or similar investments issued by ZCool. As of June 30, 2018, the Company’s total investment in ZCool is approximately $15.0 million, which is reported in other non-current assets.