Employee Stock Benefit Plans (Details) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended
	Feb. 28, 2013	Mar. 31, 2014	Mar. 31, 2013
Weighted Average Exercise Price [Roll Forward]
Unrecognized compensation cost related to non-vested option grants and stock awards		$ 8,057
Weighted-average period over which unrecognized compensation is expected to be recognized		2 years 7 months 6 days
Weighted average assumptions to estimate fair value of grants of stock options [Abstract]
Aggregate fair value of options granted	718
Total stock based compensation expense		$ 1,262	$ 1,290
Stock Options [Member]
Number of Options [Roll Forward]
Outstanding (in shares)		1,132,678
Granted (in shares)		71,500
Exercised (in shares)		0
Cancelled (in shares)		(2,499)
Outstanding (in shares)		1,201,679
Options exercisable (in shares)		517,179
Weighted Average Exercise Price [Roll Forward]
Outstanding (in dollars per share)		$ 16.51
Granted (in dollars per share)		$ 14.80
Exercised (in dollars per share)		$ 0
Cancelled (in dollars per share)		$ 102.48
Outstanding (in dollars per share)		$ 16.23
Options exercisable (in dollars per share)		$ 16.45
Weighted average assumptions to estimate fair value of grants of stock options [Abstract]
Risk-free interest rate (in hundredths)		2.11%
Volatility (in hundredths)		81.16%
Expected dividend yield (in hundredths)		0.00%
Expected life		5 years 6 months
Estimated forfeiture rate (in hundredths)		0.00%
Options granted to purchase common stock (in shares)		71,500
Strike price of options granted (in dollars per share)		$ 14.80
Stock Options [Member] | Employees And Consultants [Member]
Number of Options [Roll Forward]
Granted (in shares)	71,500
Weighted Average Exercise Price [Roll Forward]
Granted (in dollars per share)	$ 14.80
Weighted average assumptions to estimate fair value of grants of stock options [Abstract]
Options granted to purchase common stock (in shares)	71,500
Strike price of options granted (in dollars per share)	$ 14.80
Vesting period of options granted	5 years
Expiration period of options granted	10 years
Non-Employee Director Stock Option Plan [Member]
Employee Stock Benefit Plan [Abstract]
Common stock authorized in stock option plan (in shares)		120,000
Non-Employee Director Stock Option Plan [Member] | Common Stock [Member]
Employee Stock Benefit Plan [Abstract]
Common stock issued or reserved for issuance (in shares)		7,000
Non-Employee Director Stock Option Plan [Member] | Stock Options [Member]
Employee Stock Benefit Plan [Abstract]
Common stock issued or reserved for issuance (in shares)		14,578
2005 Equity Plan [Member]
Employee Stock Benefit Plan [Abstract]
Common stock authorized in stock option plan (in shares)		3,000,000
2005 Equity Plan [Member] | Common Stock [Member]
Employee Stock Benefit Plan [Abstract]
Common stock issued or reserved for issuance (in shares)		753,095
2005 Equity Plan [Member] | Stock Options [Member]
Employee Stock Benefit Plan [Abstract]
Common stock issued or reserved for issuance (in shares)		1,187,101