Organization and Significant Accounting Policies - Revisions to Statements of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income tax benefit									$ (33)	$ 580	$ (1,664)
Net loss from continuing operations	$ 900	$ 1,055	$ (1,679)	$ (191)	$ 1,004	$ (178)	$ (5,585)	$ (1,776)	85	(6,535)	(14,588)
Net loss	$ 896	$ 1,045	$ (1,753)	$ (216)	$ (672)	$ (417)	$ (6,854)	$ (2,506)	(28)	(10,449)	(17,388)
Comprehensive loss									$ (545)	$ (9,649)	$ (17,400)
Basic loss per common share
Continuing operations (in dollars per share)	$ 0.04	$ 0.04	$ (0.07)	$ (0.01)	$ 0.04	$ (0.01)	$ (0.24)	$ (0.07)	$ 0.00	$ (0.28)	$ (0.62)
Discontinued operations (in dollars per share)	0.00	0.00	0.00	0.00	(0.07)	(0.01)	(0.05)	(0.03)	0.00	(0.16)	(0.12)
Basic (in dollars per share)	0.04	0.04	(0.07)	(0.01)	(0.03)	(0.02)	(0.29)	(0.10)	0.00	(0.44)	(0.01)
Diluted net loss per common share
Continuing operations (in dollars per share)	0.04	0.04	(0.07)	(0.01)	0.04	(0.01)	(0.24)	(0.07)	0.00	(0.28)	(0.62)
Discontinued operations (in dollars per share)	0.00	0.00	0.00	0.00	(0.07)	(0.01)	(0.05)	(0.03)	0.00	(0.16)	(0.12)
Diluted (in dollars per share)	$ 0.04	$ 0.04	$ (0.07)	$ (0.01)	$ (0.03)	$ (0.02)	$ (0.29)	$ (0.10)	$ 0.00	$ (0.44)	$ (0.74)
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income tax benefit										$ 46
Net loss from continuing operations										(7,069)
Net loss										(10,983)
Comprehensive loss										$ (10,183)
Basic loss per common share
Continuing operations (in dollars per share)										$ (0.30)
Discontinued operations (in dollars per share)										(0.16)
Basic (in dollars per share)										(0.46)
Diluted net loss per common share
Continuing operations (in dollars per share)										(0.30)
Discontinued operations (in dollars per share)										(0.16)
Diluted (in dollars per share)										$ (0.46)
Revision
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income tax benefit										$ 534
Net loss from continuing operations										534
Net loss										534
Comprehensive loss										$ 534
Basic loss per common share
Continuing operations (in dollars per share)										$ 0.02
Discontinued operations (in dollars per share)										0.00
Basic (in dollars per share)										0.02
Diluted net loss per common share
Continuing operations (in dollars per share)										0.02
Discontinued operations (in dollars per share)										0.00
Diluted (in dollars per share)										$ 0.02