Stockholders’ Equity and Earnings (Loss) per Share - Basic and Diluted Computation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Net loss (numerator):
Net loss	$ (15,199)	$ (10,120)	$ (28,223)	$ (10,547)	$ (12,858)	$ (2,373)	$ (53,542)	$ (25,778)
Loss per share:
Basic and diluted (in dollars per share)	$ (2.67)			$ (2.80)			$ (11.91)	$ (6.82)
Shares (denominator):
Weighted average common shares outstanding - basic (in shares)	5,703			3,770			4,495	3,780
Weighted average common shares outstanding - diluted (in shares)	5,703			3,770			4,495	3,780