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Summary of Significant Accounting Policies - Net Income (Loss) per Common Share (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accounting Policies [Abstract]
Anti-dilutive common stock equivalents related to options and restricted stock awards excluded from fully diluted calculation	861,823	597,463	196,076
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Weighted average common shares outstanding—basic	14,777,175	14,767,606	14,419,599
Dilutive common shares issuable in connection with stock plans	241,776	304,736	430,726
Weighted average common shares outstanding—diluted	15,018,951	15,072,342	14,850,325

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of contingently issuable shares. Contingently issuable shares are those shares that are issuable for little or no cash contingent on certain conditions being met.

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