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Quarterly Results (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information The following is a summary of certain quarterly financial information for the fiscal years 2018 and 2017:
 
First
Quarter		Second
Quarter		Third
Quarter		Fourth
Quarter		Total
(in thousands, except per share data)
Year Ended December 31, 2018     
Total revenues, net$14,545 $16,249 $18,294 $16,777 $65,865 
Gross profit5,220 4,784 6,719 5,662 22,385 
Operating loss(3,531)(4,910)(1,213)(5,445)(15,099)
Net loss(4,802)(13,119)(3,945)(14,390)(36,256)
Net loss attributable to common stockholders(4,802)(13,119)(3,945)(14,390)(36,256)
Basic loss per share$(0.09)$(0.25)$(0.07)$(0.27)$(0.68)
Diluted loss per share$(0.09)$(0.25)$(0.07)$(0.27)$(0.68)
Year Ended December 31, 2017     
Total revenues, net$17,663 $16,432 $11,340 $14,767 $60,202 
Gross profit10,934 8,037 2,538 5,863 27,372 
Operating income (loss)2,967 (1,782)(8,039)(4,943)(11,797)
Net income (loss)831 (919)(8,982)(6,121)(15,191)
Net income (loss) attributable to common stockholders831 (919)(8,982)(6,121)(15,191)
Basic income (loss) per share$0.02 $(0.02)$(0.17)$(0.11)$(0.28)
Diluted income (loss) per share$0.02 $(0.02)$(0.17)$(0.11)$(0.28)