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Summary of Significant Accounting Policies - Reconciliation of Basic and Diluted Income (Loss) per Share (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Numerator:                      
(Loss) income from continuing operations $ (7,805) $ (3,177) $ (3,916) $ (1,977) $ 1,657 $ 4,398 $ 2,192 $ 1,224 $ (16,875) $ 9,471 $ (4,246)
Loss from discontinued operations 0 0 0 (12) (373) (142) (81) (95) (12) (691) (1,599)
Net (loss) income $ (7,805) $ (3,177) $ (3,916) $ (1,989) $ 1,284 $ 4,256 $ 2,111 $ 1,129 $ (16,887) $ 8,780 $ (5,845)
Denominator:                      
Basic weighted average common shares outstanding (in shares)                 11,673 10,413 7,816
Potential common shares from options and warrants (in shares)                 0 339 0
Diluted weighted average shares (in shares)                 11,673 10,752 7,816