Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts receivable, current	$ 83	$ 107
Accumulated depreciation on property and equipment	34,129	33,862
Accumulated amortization on intangible assets	$ 15,138	$ 14,508
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares issued	1,029,072	1,029,072
Common stock, shares outstanding	912,754	912,754
Treasury stock, shares	116,318	116,318