Description of Business and Summary of Significant Accounting Policies - Adjustments for New Accounting Policies (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating activities	$ (26,241)	$ (153)
Financing activities	29,273	7,553
Net change in cash, cash equivalents, and restricted cash	$ (1,013)	(1,788)
Previously reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating activities		(371)
Financing activities		(261)
Net change in cash, cash equivalents, and restricted cash		(9,820)
Accounting Standards Update 2016-18 | Adjustments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating activities		218
Financing activities		7,814
Net change in cash, cash equivalents, and restricted cash		$ (8,032)