Loss Per Share - Reconciliations of Basic and Diluted Earnings (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net loss	$ (8,304)	$ (8,513)	$ (16,307)	$ (13,654)
Denominator:
Weighted average common shares outstanding (in shares)	2,203	2,000	2,150	2,000
Effect of dilutive securities:
Outstanding common stock equivalents (in shares)	0	0	0	0
Denominator for diluted loss per common share (in shares)	2,203	2,000	2,150	2,000
Basic and diluted earnings (loss) per common share:
Basic loss per common share (in dollars per share)	$ (3.77)	$ (4.26)	$ (7.58)	$ (6.83)
Diluted loss per common share (in dollars per shares)	$ (3.77)	$ (4.26)	$ (7.58)	$ (6.83)
Excluded outstanding share-based awards having an anti-dilutive effect (in shares)	1,437	1,803	1,518	1,803