Fair Value of Financial Instruments	3 Months Ended
Fair Value of Financial Instruments	Mar. 31, 2020
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Fair Value of Financial Instruments Authoritative guidance on fair value measurements defines fair value, establishes a framework for measuring fair value and stipulates the related disclosure requirements. The Company follows a three-level hierarchy, under which the fair value hierarchy prioritizes the inputs used to measure fair value. The three‑tiered hierarchy is summarized as follows: Level 1—Quoted prices in active markets for identical assets and liabilities. Level 2—Other significant observable inputs. Level 3—Significant unobservable inputs. Due to their highly liquid nature, the amount of the Company’s other financial instruments, including cash and cash equivalents, restricted cash, accounts and unbilled receivables, accounts payable and accrued multi-client data library royalties, represent their approximate fair value. The carrying amounts of the Company’s long-term debt at March 31, 2020 and December 31, 2019 were $149.7 million and $123.4 million, respectively, compared to its fair values of $77.4 million and $116.6 million at March 31, 2020 and December 31, 2019, respectively. The fair value of the long-term debt was calculated using Level 2 inputs using significant observable data points for similar liabilities where estimated values are determined from observable transactions. Fair value measurements are applied with respect to non-financial assets and liabilities when possible indicators of impairment exists, which would consist primarily of goodwill, multi-client data library and property, plant and equipment. The fair value of these assets is determined based on valuation techniques using the best information available and may include market comparables and discounted cash flow projections.

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.