CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Common stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated other comprehensive loss	Total
Balance at the beginning of period at Dec. 31, 2018	$ 7	$ 632,742	$ (239,554)	$ (706)	$ 392,489
Balance at the beginning of period (in shares) at Dec. 31, 2018	6,874,622
Stock-based compensation		135			135
Stock-based compensation (in shares)	1,050
Net income (loss)			(37,209)		(37,209)
Foreign currency translation				(22)	(22)
Balance at the end of period at Mar. 31, 2019	$ 7	632,877	(276,763)	(728)	355,393
Balance at the end of period (in shares) at Mar. 31, 2019	6,875,672
Balance at the beginning of period at Dec. 31, 2019	$ 7	633,246	(279,144)	(712)	353,397
Balance at the beginning of period (in shares) at Dec. 31, 2019	6,875,672
Stock-based compensation		104			104
Net income (loss)			60,242		60,242
Foreign currency translation				428	428
Balance at the end of period at Mar. 31, 2020	$ 7	$ 633,350	$ (218,902)	$ (284)	$ 414,171
Balance at the end of period (in shares) at Mar. 31, 2020	6,875,672