Income Taxes - Effective Income Tax Expense Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Tax computed at the federal statutory rate	$ (18)	$ 2,826	$ 5,973
State tax, federally effected	19	173	1,212
Stock compensation	1,459	21	1,080
Tax credits	(261)	(131)	(152)
State rate adjustment	(21)	15	764
Meals & entertainment	72	75	49
Transaction costs	146	0	35
Uncertain tax positions	6	8	14
Return to provision	60	40	(80)
Rate differential	0	2	(80)
Valuation allowance	237	31	0
Income tax provision	$ 1,699	$ 3,060	$ 8,815

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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to pretax Income or Loss from continuing operations; income tax expense or benefit may include interest and penalties on tax uncertainties based on the entity's accounting policy.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to changes in the valuation allowance for deferred tax assets in the period.

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The portion of the difference, between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to total foreign income tax expense or benefit. The foreign income tax expense or benefit difference represents the income tax expense or benefit at applicable domestic statutory income tax rates applied to foreign earnings or loss for the period versus the foreign income tax expense or benefit calculated by applying the appropriate foreign tax rates.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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