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Summary of Significant Accounting Policies - Basic and diluted loss per share (Details 1) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2019	Mar. 31, 2018
Numerator:
Net loss per consolidated statements of loss	$ (4,745)	$ (905)	$ 582	$ 1,420	$ 644	$ (2,898)	$ 344	$ 812	$ (3,648)	$ (1,098)
Net loss allocated to common stock									(3,648)	(1,098)
Basic loss per share computation:
Net loss allocated to common stock									$ (3,648)	$ (1,098)
Weighted average common shares outstanding, including shares considered participating securities									7,861	7,819
Weighted average shares of common stock									7,861	7,819
Basic loss per share	$ (0.60)	$ (0.12)	$ 0.07	$ 0.18	$ 0.08	$ (0.37)	$ 0.04	$ 0.10	$ (0.46)	$ (0.14)
Diluted loss per share computation:
Loss allocated to common stock									$ (3,648)	$ (1,098)
Numerator for diluted loss per share									$ (3,648)	$ (1,098)
Weighted average common shares outstanding for basic loss per share									7,861	7,819
Weighted average shares and dilutive potential common shares									7,861	7,819
Diluted loss per share	$ (0.60)	$ (0.12)	$ 0.07	$ 0.18	$ 0.08	$ (0.37)	$ 0.04	$ 0.10	$ (0.46)	$ (0.14)

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