CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Allowance for doubtful accounts	$ 249	$ 225
Current portion of term loan credit agreement, deferred costs	110	110
Revolving and term loan credit agreement, deferred costs	$ 265	$ 293
Common Stock, authorized (in shares)	75,000	75,000
Common Stock, issued (in shares)	32,724	31,595
Common Stock, outstanding (in shares)	32,724	31,595
Series B-2
Convertible preferred stock, authorized (in shares)	39	39
Convertible preferred stock, reserved (in shares)	39	39
Convertible preferred stock, issued (in shares)	0	0
Convertible preferred stock, outstanding (in shares)	12	12

For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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