Subsequent Events	12 Months Ended
Dec. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	16. Subsequent Events On January 16, 2020, the Company acquired Autolist, an automotive shopping platform based in San Francisco, California, pursuant to an Agreement and Plan of Merger by and among the Company, Alpine Merger Sub, Inc., a Delaware corporation and wholly-owned subsidiary of the Company (“Merger Sub”), Auto List, Inc., a Delaware corporation (“Target”), and the stockholder representative(s) named therein, pursuant to which, among other things, the Company acquired Target through the merger of Merger Sub with and into Target (the “Merger”), with Target surviving as a wholly owned subsidiary of the Company. The Company paid an aggregate of approximately $22.0 million to consummate the Merger, inclusive of $2.2 million that is held in escrow to secure post-closing claims. The Merger is intended to both expand the Company’s consumer audience in the United States and enhance its value proposition for subscribing dealers. During the year ended December 31, 2019, the Company incurred total acquisition-related costs of $0.4 million related to the transaction. As the transaction occurred subsequent to period-end, the Company is still evaluating the purchase price allocation of the transaction but expects the primary assets acquired to be intangible assets and goodwill. Acquired tangible assets and assumed liabilities are expected to be immaterial. The allocation is expected to be finalized during the first half of 2020.

Subsequent Events

12 Months Ended

Dec. 31, 2019

16. Subsequent Events

On January 16, 2020, the Company acquired Autolist, an automotive shopping platform based in San Francisco, California, pursuant to an Agreement and Plan of Merger by and among the Company, Alpine Merger Sub, Inc., a Delaware corporation and wholly-owned subsidiary of the Company (“Merger Sub”), Auto List, Inc., a Delaware corporation (“Target”), and the stockholder representative(s) named therein, pursuant to which, among other things, the Company acquired Target through the merger of Merger Sub with and into Target (the “Merger”), with Target surviving as a wholly owned subsidiary of the Company. The Company paid an aggregate of approximately $22.0 million to consummate the Merger, inclusive of $2.2 million that is held in escrow to secure post-closing claims. The Merger is intended to both expand the Company’s consumer audience in the United States and enhance its value proposition for subscribing dealers. During the year ended December 31, 2019, the Company incurred total acquisition-related costs of $0.4 million related to the transaction. As the transaction occurred subsequent to period-end, the Company is still evaluating the purchase price allocation of the transaction but expects the primary assets acquired to be intangible assets and goodwill. Acquired tangible assets and assumed liabilities are expected to be immaterial. The allocation is expected to be finalized during the first half of 2020.