CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Allowance for doubtful accounts	$ 225	$ 68
Current portion of revolving and term loan credit agreement, deferred costs	110	0
Noncurrent portion of revolving and term loan credit agreement, deferred costs	$ 293	$ 0
Common stock, shares authorized (in shares)	75,000	75,000
Common stock, shares issued (in shares)	31,595	23,789
Common stock, shares outstanding (in shares)	31,595	23,789
Treasury stock, shares reserved (in shares)	0	1,250
Series A
Convertible preferred stock, shares authorized (in shares)	1	1
Convertible preferred stock, shares reserved (in shares)	1	1
Convertible preferred stock, shares issued (in shares)	0	1
Convertible preferred stock, shares outstanding (in shares)	0	1
Series B-2
Convertible preferred stock, shares authorized (in shares)	39	39
Convertible preferred stock, shares reserved (in shares)	39	39
Convertible preferred stock, shares issued (in shares)	12	12
Convertible preferred stock, shares outstanding (in shares)	12	12