Stock-Based Compensation (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Stock-based compensation in the form of employee stock options and restricted stock [Abstract]
Total stock-based compensation	$ 292,000	$ 332,000
Tax effect on stock-based compensation	0	0
Net effect on net income (loss)	292,000	332,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation costs related to unvested stock options not yet recognized	1,400,000
Value of estimated forfeitures	92,000
Weighted-average period of amortization	2 years 7 months 6 days
Number of options outstanding [Roll Forward]
Options outstanding, beginning of period (in shares)	2,671,000
Granted (in shares)	0	0
Exercised (in shares)	0
Canceled and expired (in shares)	(74,000)
Options outstanding, end of period (in shares)	2,597,000		2,671,000
Options vested and expected to vest as of March 31, 2014	2,597,000
Options exercisable as of March 31, 2014	1,663,000
Weighted average exercise price [Roll Forward]
Options outstanding, beginning of period (in dollars per share)	$ 3.29
Granted (in dollars per share)	$ 0
Exercised (in dollars per share)	$ 0
Canceled and expired (in dollars per share)	$ 5.18
Options outstanding, end of period (in dollars per share)	$ 3.24		$ 3.29
Options vested and expected to vest as of March 31, 2014	$ 3.24
Options exercisable as of March 31, 2014	$ 3.30
Weighted average Remaining Contractual Life [Abstract]
Options outstanding, beginning of period	6 years 7 months 24 days		6 years 8 months 16 days
Options outstanding, end of period	6 years 7 months 24 days		6 years 8 months 16 days
Options vested and expected to vest, end of period	6 years 7 months 24 days
Option exercisable, end of period	5 years 5 months 5 days
Aggregate Intrinsic Value [Abstract]
Options outstanding, beginning of period	893,000
Options outstanding, end of period	438,000		893,000
Options vested and expected to vest, end of period	438,000
Options exercisable, end of period	438,000
Closing price (in dollars per share)	$ 2.20
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average period of amortization	2 years 3 months 18 days
Shares [Roll Forward]
Non-vested, beginning of period (in shares)	241,232
Granted (in shares)	0
Vested (in shares)	0
Non-vested, end of period (in shares)	241,232
Weighted Average Grant Date Fair Value [Roll Forward]
Non-vested, beginning of period (in dollars per share)	$ 3.44
Granted (in dollars per share)	$ 0
Vested (in dollars per share)	$ 0
Non-vested, end of period (in dollars per share)	$ 3.44
Unrecognized compensation expense related to restricted stock awards	581,000
Cost of revenue [Member]
Stock-based compensation in the form of employee stock options and restricted stock [Abstract]
Total stock-based compensation	5,000	6,000
Selling, general and administrative [Member]
Stock-based compensation in the form of employee stock options and restricted stock [Abstract]
Total stock-based compensation	244,000	284,000
Research and development [Member]
Stock-based compensation in the form of employee stock options and restricted stock [Abstract]
Total stock-based compensation	$ 43,000	$ 42,000