Revision of Prior Financial Statements - Balance Sheet Impact (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Balance Sheet
Accumulated other comprehensive income	$ 51	$ 58	$ 181	$ 185	$ 149	$ 125	$ 31
Retained earnings (accumulated deficit)	$ (215,766)	(206,205)	(142,238)	(102,917)	(91,874)	(77,461)	(108,323)
As previously reported
Balance Sheet
Accumulated other comprehensive income		(1,089)	(966)	(962)	(998)	(1,022)	(1,116)
Retained earnings (accumulated deficit)		(205,058)	(141,091)	(101,770)	(90,727)	(76,314)	(107,176)
Revisions
Balance Sheet
Accumulated other comprehensive income		1,147	1,147	1,147	1,147	1,147	1,147
Retained earnings (accumulated deficit)		$ (1,147)	$ (1,147)	$ (1,147)	$ (1,147)	$ (1,147)	$ (1,147)