Intangible Assets, Net - Intangible Assets Other than Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]
Intangible Assets, Net	$ 20,997	$ 19,971
Software Developed for Internal Use
Finite Lived Intangible Assets [Line Items]
Intangible Assets, Gross Amount	24,570	22,990
Intangible Assets, Accumulated Amortization	(3,573)	(3,019)
Intangible Assets, Net	$ 20,997	$ 19,971
Software Developed for Internal Use | Minimum
Finite Lived Intangible Assets [Line Items]
Amortization Period	5 years
Software Developed for Internal Use | Maximum
Finite Lived Intangible Assets [Line Items]
Amortization Period	10 years