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Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Accounts receivable, allowances	$ 295	$ 367
Property and equipment, accumulated depreciation	67,834	66,262
Intangible assets, accumulated amortization	$ 7,278	$ 6,280
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	190,000	190,000
Common stock, shares issued (in shares)	42,783	39,793
Common stock, shares outstanding (in shares)	42,783	39,793

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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