Stockholders' Equity (Deficit) (Detail Textuals 1) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended									2 Months Ended	12 Months Ended
	Apr. 05, 2016	Nov. 30, 2016	May 20, 2016	Apr. 30, 2016	Mar. 31, 2016	Jan. 31, 2016	Sep. 30, 2015	Apr. 30, 2015	Mar. 31, 2015	Feb. 28, 2015	May 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Stockholders Equity Deficit [Line Items]
Stock-based compensation expense												$ 300	$ 2,605
Number of shares in reserve												2,800,883	2,297,625
Chang Family Trust
Stockholders Equity Deficit [Line Items]
Threshold limit of common stock on exceeding which need shareholders approval for exercising						19.99%
Exercise price per warrants						$ 1.75
Number of common stock called by warrants						114,286
Warrant term						2 years
Accredited investors
Stockholders Equity Deficit [Line Items]
Threshold limit of common stock on exceeding which need shareholders approval for exercising		4.99%		4.99%							4.99%
Exercise price per warrants		$ 1.85		$ 1.85							$ 1.85
Number of common stock called by warrants		28,378		18,162							9,081
Warrant term		2 years		2 years							2 years
Unsecured Debt | Accredited investors | Loan Agreement
Stockholders Equity Deficit [Line Items]
Threshold limit of common stock on exceeding which need shareholders approval for exercising	4.99%		4.99%		4.99%
Exercise price per warrants	$ 1.85		$ 1.85		$ 1.85
Number of common stock called by warrants	18,162		9,081		79,459
Warrant term	2 years		2 years		2 years
Initial public offering | Common Stock
Stockholders Equity Deficit [Line Items]
Stock-based compensation expense							$ 363
Underwriters option
Stockholders Equity Deficit [Line Items]
Number of common stock called by warrants							71,500
Private placement
Stockholders Equity Deficit [Line Items]
Number of common stock sold in IPO								143,000	62,500	55,000			140,000
Public offering price (in dollars per share)								$ 3.50	$ 4.00	$ 4.52
Net proceeds from issuance initial public offering								$ 501	$ 250	$ 248			$ 374
Exercise price per warrants													$ 1.75
Number of common stock called by warrants													28,000
Warrant term													2 years