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Fair Value Measurement	12 Months Ended
Fair Value Measurement	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurement	Fair Value Measurement The Company records certain financial instruments at fair value in accordance with the hierarchy from the Fair Value Measurements and Disclosures Topic of the FASB ASC as follows. Fair Value of Assets Level 1: Observable inputs such as quoted prices in active markets for identical assets. Level 2: Inputs other than quoted prices that are observable for the asset or liability, either directly or indirectly. These include quoted prices for similar assets or liabilities in active markets and quoted prices for identical or similar assets or liabilities in markets that are not active. Level 3: Unobservable inputs that reflect the reporting entity’s own assumptions. As of December 31, 2018 and 2017, the fair value of the Company’s convertible senior notes issued in September and October 2017 was approximately $36.0 million and $52.6 million, respectively, and was measured using Level 2 inputs. The carrying value of other short-term and long-term borrowings approximates fair value because of the relative short maturity of these instruments and the interest rates the Company could currently obtain.