Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Numerator [Abstract]
Net loss - numerator for basic loss per share	$ (517)		$ (1,101)		$ (10,113)		$ (5,051)
Denominator [Abstract]
Shares used for basic loss per share (in shares)	35,285		34,188		35,219		34,089
Shares used for diluted loss per share (in shares)	35,285	[1]	34,188	[1]	35,219	[1]	34,089	[1]
Loss per share [Abstract]
Basic (in dollars per share)	$ (0.01)		$ (0.03)		$ (0.29)		$ (0.15)
Diluted (in dollars per share)	$ (0.01)	[1]	$ (0.03)	[1]	$ (0.29)	[1]	$ (0.15)	[1]
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 loss per share because their effect is antidilutive (in shares)	2,237		3,848		2,164		3,892
Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive securities outstanding not included in the computation of loss per share because their effect is antidilutive (in shares)	300		339		298		423
Performance Stock Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive securities outstanding not included in the computation of loss per share because their effect is antidilutive (in shares)	1		0		7		0
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 loss per share because their effect is antidilutive (in shares)	7,707		0		7,707		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 loss per share because their effect is antidilutive (in shares)	892		0		892		0
CareFirst Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive securities outstanding not included in the computation of loss per share because their effect is antidilutive (in shares)	36		0		34		0
Non-Qualified Stock Options [Member]
Denominator [Abstract]
Effect of dilutive stock options and restricted stock units outstanding (in shares)	0	[1]	0	[1]	0	[1]	0	[1]
Restricted Stock Units [Member]
Denominator [Abstract]
Effect of dilutive stock options and restricted stock units outstanding (in shares)	0	[1]	0	[1]	0	[1]	0	[1]

[1] The assumed exercise of stock-based compensation awards for the three and six months ended June 30, 2014 and 2013 was not considered because the impact would be anti-dilutive.