Fair Value of Financial Instruments	6 Months Ended
Fair Value of Financial Instruments	Jun. 30, 2013
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	(10) Fair Value of Financial Instruments U.S. GAAP establishes a framework for measuring fair value under generally accepted accounting principles and enhances disclosures about fair value measurements. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The standard describes the following fair value hierarchy based on three levels of inputs, of which the first two are considered observable and the last unobservable, that may be used to measure fair value: Level 1: Quoted prices in active markets for identical assets or liabilities. Level 2: Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3: Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. The fair value of cash and cash equivalents are classified as level 1 at June 30, 2013 and December 31, 2012. The fair value of short-term investments is determined based on quoted market prices on the balance sheet date and are classified as a Level 1 investment at December 31, 2012. There we no short-term investments at June 30, 2013. The estimated fair value of the Common Stock warrant liability resulting from the October 2009 registered direct offering of 10,900,000 shares of Common Stock and warrants to purchase 5,450,000 shares of Common Stock and is determined by using the Black-Scholes option pricing model based on Columbia’s stock price at the measurement date, exercise price of the warrant, risk-free rate and historical volatility, and are classified as a Level 2 measurement. Columbia recorded a charge of $0.2 million for the three months ended June 30, 2013 as compared to income of $0.2 million for the three months ended June 30, 2012 as a result of the change in stock price. During the six months ended June 30, 2013 and 2012, Columbia recorded income of $0.1 million and $6.5 million, respectively, as a result of the change in the stock price. The fair value of accounts receivable and accounts payable approximate their carrying amount.

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

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