Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Class of Stock [Line Items]
Operating expenses	$ 83,327	$ 208,195	$ 83,740
Fixed asset impairment		66,087
Operating lease right-of-use assets	3,612	0
Present value of lease liabilities	2,964
Accounting Standards Update 2016-02
Class of Stock [Line Items]
Operating lease right-of-use assets				$ 5,046
Present value of lease liabilities				$ 5,131
Developed Technology | Noctiva
Class of Stock [Line Items]
Fixed asset impairment		66,087
Advertising
Class of Stock [Line Items]
Operating expenses	$ 372	$ 17,562	$ 2,214