Stockholder's Equity and Stock-Based Compensation Expense - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued or committed for issuance under outstanding stock options (in shares)	669,209	778,875
Stock-based compensation expense	$ 617	$ 1,293
Restricted Stock and Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of restricted stock and shares reserved for restricted stock units outstanding (in shares)	903,204	988,426	908,754
Stock Appreciation Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued or committed for issuance under outstanding stock options (in shares)	937,597	1,305,013	954,679
Stock-based compensation expense	$ (1,100)	$ 4,500

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Number of options outstanding, including both vested and non-vested options.

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