Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Allowance for bad debts	$ 709	$ 236
Preferred stock, authorized	5,000,000	5,000,000
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	275,000,000	275,000,000
Common stock, shares issued	391,739	73,092
Common stock, shares outstanding	391,739	73,092
Series B convertible preferred stock
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, issued	3	159
Preferred stock outstanding	3	159
Series C convertible preferred stock
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, issued	95,388	95,388
Preferred stock outstanding	95,388	95,388