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Supplemental Data (Unaudited)
12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Supplemental Data (Unaudited)
NOTE 20. SUPPLEMENTAL DATA (UNAUDITED)

The following is a summary of unaudited selected quarterly financial information for the three months ended 2018 (in thousands, except per share data):
 
December 31,
September 30,
June 30,
March 31,
Revenue
$
1,822

$
1,355

$
1,692

$
801

Gross profit
$
524

$
675

$
975

$
309

Loss from operations
$
(19,759
)
$
(19,369
)
$
(20,415
)
$
(20,826
)
Net loss
$
(22,191
)
$
(22,098
)
$
(23,225
)
$
(20,812
)
Basic and diluted net loss per share
$
(0.41
)
$
(0.41
)
$
(0.43
)
$
(0.37
)

The following is a summary of unaudited selected quarterly financial information for the three months ended 2017 (in thousands, except per share data):

 
December 31,
September 30,
June 30,
March 31,
Revenue
$
2,120

$
828

$
699

$
530

Gross profit
$
1,470

$
637

$
564

$
504

Loss from operations
$
(16,136
)
$
(17,315
)
$
(16,423
)
$
(14,310
)
Net loss
$
(16,296
)
$
(17,075
)
$
(16,457
)
$
(14,200
)
Basic and diluted net loss per share
$
(0.29
)
$
(0.31
)
$
(0.31
)
$
(0.27
)