Income Taxes - Provisions/ Benefit (Details) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal													$ 0	$ 0	$ 0
State													26	191	25
Foreign													595	1,407	621
Total current													621	1,598	646
Federal													0	0	0
State													0	0	0
Foreign													12	(61)	(10)
Total deferred													12	(61)	(10)
Provision for income taxes	$ 31	$ 136	$ 258	$ 208	$ 1,079	$ (3)	$ 128	$ 333	$ 466	$ 461	$ 602	$ 458	$ 633	$ 1,537	$ 636