Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Allowance for doubtful accounts	$ 1,317	$ 802
Common stock, par value (in USD per share)	$ 0.001	$ 0.001
Common stock, authorized (in shares)	170,000,000	170,000,000
Common stock, issued (in shares)	18,190,054	10,387,926
Common stock, outstanding (in shares)	18,098,464	10,345,367
Treasury stock (in shares)	91,590	42,559
Convertible Preferred Stock
Convertible preferred stock, par value (in USD per share)	$ 0.001	$ 0.001
Convertible preferred stock, authorized (in shares)	5,000,000	5,000,000
Convertible preferred stock, issued (in shares)	0	0
Convertible preferred stock, outstanding (in shares)	0	0

Amount of allowance for credit loss on accounts receivable, classified as current.

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