Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Statement Of Financial Position [Abstract]
Long-term debt, fair value	$ 46,485	$ 47,277
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	260,000,000	260,000,000
Common stock, shares issued	15,334,000	15,138,000
Treasury stock, shares	3,490,000	3,421,000