Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Effective tax rate of provision for income taxes difference from federal statutory rate
Income tax benefit	$ (102)	$ 0	$ (1,547)	$ 0
Effective income tax rate (as a percent)	0.60%		2.50%
Discrete tax benefit for 2017 Australia refundable R&D tax offset			$ 1,100
Federal statutory income tax rate (as a percent)	21.00%		21.00%