Employee Stock Benefit Plans (Details) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended		3 Months Ended	6 Months Ended	1 Months Ended	0 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Stock Options [Member]	Jun. 30, 2014 Stock Options [Member]	Feb. 28, 2013 Stock Options [Member] Employees And Consultants [Member]	May 12, 2014 Stock Options [Member] Executive Employees [Member]	May 12, 2014 Restricted Stock [Member] LCA [Member] Employees And Consultants [Member]	May 12, 2014 Restricted Stock [Member] LCA [Member] Employees And Consultants [Member] Executive	Jun. 30, 2014 Non-Employee Director Stock Option Plan [Member]	Jul. 31, 2014 Non-Employee Director Stock Option Plan [Member] Subsequent Event [Member]	Jun. 30, 2014 Non-Employee Director Stock Option Plan [Member] Common Stock [Member]	Jun. 30, 2014 Non-Employee Director Stock Option Plan [Member] Stock Options [Member]	Jun. 30, 2014 2005 Equity Plan [Member]	Jul. 31, 2014 2005 Equity Plan [Member] Subsequent Event [Member]	Jun. 30, 2014 2005 Equity Plan [Member] Common Stock [Member]	Jun. 30, 2014 2005 Equity Plan [Member] Stock Options [Member]
Employee Stock Benefit Plan [Abstract]
Common stock authorized in stock option plan (in shares)									120,000	370,000			3,000,000	6,000,000
Common stock issued or reserved for issuance (in shares)											7,000	14,578			867,432	1,293,601
Number of Options [Roll Forward]
Outstanding (in shares)				1,132,678
Granted (in shares)				180,500	71,500	109,000
Exercised (in shares)				0
Cancelled (in shares)				(4,999)
Outstanding (in shares)			1,308,179	1,308,179
Options exercisable (in shares)			517,179	517,179
Weighted Average Exercise Price [Roll Forward]
Outstanding (in dollars per share)				$ 16.51
Granted (in dollars per share)				$ 14.11	$ 14.80	$ 13.70
Exercised (in dollars per share)				$ 0
Cancelled (in dollars per share)				$ 58.63
Outstanding (in dollars per share)			$ 16.02	$ 16.02
Options exercisable (in dollars per share)			$ 16.45	$ 16.45
Unrecognized compensation cost related to non-vested option grants and stock awards	$ 9,693
Weighted-average period over which unrecognized compensation is expected to be recognized	2 years 9 months 18 days
Weighted average assumptions to estimate fair value of grants of stock options [Abstract]
Risk-free interest rate (in hundredths)			2.21%	2.17%
Volatility (in hundredths)			76.61%	78.41%
Expected dividend yield (in hundredths)			0.00%	0.00%
Expected life			5 years 6 months	5 years 6 months
Estimated forfeiture rate (in hundredths)			0.00%	0.00%
Number of shares issued to non-employee director (in shares)	5,000
Aggregate fair value of shares issued to non-employee director	75
Options granted to purchase common stock (in shares)				180,500	71,500	109,000
Strike price of options granted (in dollars per share)				$ 14.11	$ 14.80	$ 13.70
Vesting period of options granted					5 years	4 years	3 years
Expiration period of options granted					10 years	10 years
Number of executive employees								3
Aggregate fair value of options granted					718	975
Total stock based compensation expense	$ 2,556	$ 2,584
Restricted stock units granted (in shares)							141,337
Price of restricted stock (in dollars per share)							$ 0.01