Earnings (Loss) Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended														12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Numerator [Abstract]
Net income (loss)- numerator for basic earnings per share	$ (5,290)	[1],[2]	$ 1,799	[2]	$ (1,101)	[1]	$ (3,949)	[1]	$ 604	[3]	$ 5,028	$ 5,057	$ (2,665)	[1]	$ (8,541)		$ 8,024		$ (157,693)
Denominator [Abstract]
Shares used for basic earnings (loss) per share (in shares)															34,489		33,597		33,677
Shares used for diluted earnings (loss) per share (in shares)															34,489	[4]	33,836	[4]	33,677	[4]
Earnings per share [Abstract]
Basic (in dollars per share)															$ (0.25)		$ 0.24		$ (4.68)
Diluted (in dollars per share)															$ (0.25)	[4]	$ 0.24	[4]	$ (4.68)	[4]
Non-Qualified Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive securities outstanding not included in the computation of earnings per share because their effect is antidilutive (in shares)															3,234		4,926		4,845
Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive securities outstanding not included in the computation of earnings per share because their effect is antidilutive (in shares)															334		193		469
Warrants Related to Cash Convertible Notes [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive securities outstanding not included in the computation of earnings per share because their effect is antidilutive (in shares)															7,707		0		0
CareFirst Convertible Note [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive securities outstanding not included in the computation of earnings per share because their effect is antidilutive (in shares)															892		0		0
Non-Qualified Stock Options [Member]
Denominator [Abstract]
Effect of dilutive stock options and restricted stock units outstanding (in shares)															0	[4]	37	[4]	0	[4]
Restricted Stock Units [Member]
Denominator [Abstract]
Effect of dilutive stock options and restricted stock units outstanding (in shares)															0	[4]	202	[4]	0	[4]

[1] The assumed exercise of stock-based compensation awards for this period was not considered in the calculation of diluted earnings (loss) per share because the impact would have been anti-dilutive.

[2] Includes charges related to non-cash interest associated with amortization of a debt discount of $1.5 million and $1.6 million for the third and fourth quarter, respectively.

[3] Includes charges related to one-time termination benefits associated with capacity realignment of $1.8 million.

[4] The assumed exercise of stock-based compensation awards for the years ended December 31, 2013 and December 31, 2011 was not considered because the impact would be anti-dilutive.