Stockholders' Equity and Stock Based Compensation (Details Textual)				12 Months Ended			14 Months Ended	69 Months Ended
	Mar. 01, 2016 individual $ / shares shares	Feb. 04, 2016	Mar. 01, 2015 individual $ / shares shares	Dec. 31, 2016 USD ($) Person $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) Person $ / shares shares	Feb. 29, 2016 USD ($) shares	Dec. 22, 2016 shares	Feb. 05, 2016 $ / shares	Feb. 01, 2016 shares	Jan. 31, 2016 shares	Nov. 04, 2015 USD ($)	Dec. 31, 2013 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding options under the stock option plans (in shares)				847,635	560,797	599,069	847,635							550,567
Shares available for future grant and issuance				599,720	97,003	183,468	599,720							334,762
Maximum number of shares available for sale through ATM Program									20,000,000
Stock repurchase amount, authorized amount | $				$ 25,000,000			$ 25,000,000						$ 25,000,000
Shares repurchased, value | $				$ 964,000	$ 1,989,000		$ 3,000,000
Number of shares repurchased							451,792
Repurchased shares, average price per share (usd per share) | $ / shares							$ 6.41
Reverse stock split ratio of one share		0.066667
Common stock, shares authorized				26,666,667	26,666,667		26,666,667				26,666,667	13,300,000
Common stock, par value (usd per share) | $ / shares				$ 0.01	$ 0.01		$ 0.01			$ 0.01
Common stock, closing sale price (usd per share) | $ / shares										$ 6.21
Total intrinsic value of options exercised | $				$ 100,000	$ 100,000	$ 100,000
Cash received from option exercises | $				$ 0	$ 0	$ 100,000
Weighted average grant date fair value for stock option awards (usd per share) | $ / shares				$ 2.04	$ 16.65	$ 36.15
Purchase price of common stock, percentage of price				85.00%
Term of common stock used in determining market-based implied volatility				6 months
Prior To Reverse Stock Split [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized											400,000,000	200,000,000
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, award vesting period in years				4 years
Stock options, term in years				10 years
Restricted stock and restricted stock unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, award vesting period in years				3 years
Intrinsic value of restricted stock and restricted stock unit awards | $				$ 1,700,000			$ 1,700,000
Weighted average grant date fair value for restricted stock and restricted stock unit awards | $ / shares				$ 3.81	$ 34.20	$ 59.70
Total fair value of shares vested | $				$ 200,000	$ 600,000	$ 2,100,000
Employee stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum payroll deductions at base compensation under employee stock purchase plan								1.00%
Maximum payroll deductions at base compensation under employee stock purchase plan								10.00%
Maximum purchase limit of shares for each participant per offering period								33
Maximum purchase limit of shares for each participant annually								66
Maximum purchase limit of shares on the basis of fair market value on offering date, for each participant in any calendar year | $								$ 10,000
Purchase price of the common stock								lesser of 85% of the closing price on the first day of the applicable offering period (or most recently preceding trading day) or 85% of the closing price on the last day of the offering period
Offering period								6 months
Company recorded compensation expense approximately | $					100,000	200,000
Stock appreciation rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, award vesting period in years	4 years		4 years
Company recorded compensation expense approximately | $				$ 100,000	$ 100,000	$ 100,000
Percentage of fair market value of shares for calculation of exercise price SAR				not to be less than one hundred percent
Maximum term of SAR				10 years
Number of awards issued during period	1,210,000		207,207
Number of individuals that received SARs | individual	15		16
Exercise price of awards issued during period | $ / shares	$ 3.1		$ 34.20
Number of days volume-weighted average price of stock measured for vesting			20 days
Percentage of shares allowed to be exercised annually, if vested	33.33%		33.33%
Number of vested and outstanding stock appreciation rights				9,333			9,333
Number of individuals holding stock appreciation rights awards | Person				1			1
Weighted average exercise price of stock appreciation rights awards | $ / shares				$ 45.00			$ 45.00
Stock appreciation rights (SARs) [Member] | First one-third of awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual vesting percentage	33.33%		33.33%
Percentage that weighted average price of common stock must be greater than exercise price of SARs	120.00%		120.00%
Stock appreciation rights (SARs) [Member] | Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual vesting percentage	33.33%		33.33%
Percentage that weighted average price of common stock must be greater than exercise price of SARs	125.00%		125.00%
Stock appreciation rights (SARs) [Member] | Share-based Compensation Award, Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual vesting percentage	33.33%		33.33%
Percentage that weighted average price of common stock must be greater than exercise price of SARs	130.00%		130.00%