Restructuring Charges (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Employee Severance [Member]	Dec. 31, 2013 Employee Severance [Member] Maximum [Member]
Restructuring charges
Restructuring costs accrued and unpaid						$ 100,000
Changes in restructuring liability
Balance at the beginning of the period					43,000
Severance and related costs	160,000	421,000	360,000	2,222,000	360,000
Cash payments					(318,000)
Balance at the end of the period					$ 85,000