Stockholders' Equity and Employee Stock Option Plans (Details Textual)			12 Months Ended
	Apr. 22, 2016 right $ / shares shares	Dec. 07, 2015	Dec. 31, 2017 $ / shares shares	Dec. 31, 2016 $ / shares shares	Oct. 31, 2016 shares	Dec. 31, 2015 shares	Apr. 01, 2013 shares	Mar. 31, 2013 shares
Class of Stock [Line Items]
Class Of Warrant Or Right, Exclusion Of Beneficial Owners, Beneficial Ownership Percentage	4.99%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized					500,000
Number of shares outstanding			425,722	505,872		285,536		550,540
Common Stock, Capital Shares Reserved for Future Issuance							1,090,540	2,097,283
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant			333,982	602,825		517,505		1,546,743
Preferred Stock, Shares Authorized			5,000,000	5,000,000
Preferred Stock, Par or Stated Value Per Share | $ / shares	$ 0.01		$ 0.01	$ 0.01
Common Stock, Shares Authorized			10,000,000	10,000,000
Common Stock, Par or Stated Value Per Share | $ / shares			$ 0.01	$ 0.01
Common Stock, Shares, Outstanding			4,520,376	4,431,736
Common Stock, Dividend, Rights Issued | right	1
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right	0.0010
Common Stock [Member]
Class of Stock [Line Items]
Reverse stock split ratio		0.1
2016 Equity Incentive Plan [Member]
Class of Stock [Line Items]
Number of shares outstanding			892,629
Common Stock, Capital Shares Reserved for Future Issuance			1,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant			187,982
1997 Stock Plan [Member]
Class of Stock [Line Items]
Award vesting period (in years)			4 years
2016 Inducement Equity Incentive Plan [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized			235,000
Number of shares outstanding			89,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant			146,000
Granted After March 31, 2013 [Member] | 2016 Equity Incentive Plan [Member] | Stock Options [Member]
Class of Stock [Line Items]
Award expiration term (in years)			10 years
Granted From May 6, 2003 To March 31, 2013 [Member] | 1997 Stock Plan [Member] | Stock Options [Member]
Class of Stock [Line Items]
Award expiration term (in years)			5 years
Minimum [Member]
Class of Stock [Line Items]
Award vesting period (in years)			2 years
Maximum [Member]
Class of Stock [Line Items]
Award vesting period (in years)			3 years