CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Allowance for doubtful accounts	$ 226	$ 225
Current portion of term loan credit agreement, deferred costs	110	0
Revolving and term loan credit agreement, deferred costs	$ 211	$ 293
Common Stock, authorized (in shares)	75,000,000	75,000,000
Common Stock, issued (in shares)	34,852,000	31,595,000
Common Stock, outstanding (in shares)	34,852,000	31,595,000
Series B-2
Convertible preferred stock, authorized (in shares)	39,000	39,000
Convertible preferred stock, reserved (in shares)	39,000	39,000
Convertible preferred stock, issued (in shares)	0	12,000
Convertible preferred stock, outstanding (in shares)	0	12,000