Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Accounts receivable, allowances	$ 1,244	$ 1,170
Property and equipment, accumulated depreciation	37,824	36,344
Intangible assets, accumulated amortization	$ 23,330	$ 22,292
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	290,000,000	290,000,000
Common stock, shares issued	83,018,000	82,820,000
Common stock, shares outstanding	76,592,000	76,395,000