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Quarterly Results of Operations (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Schedule of quarterly financial data
The following table presents selected unaudited quarterly financial data for each full quarterly period of 2019 and 2018:
 
Three Months Ended(1)
(in thousands)
Mar. 31,
2018
 
Jun. 30,
2018
 
Sep. 29,
2018
 
Dec. 31,
2018
 
Mar. 30,
2019
 
Jun. 29,
2019
 
Sep. 28,
2019
 
Dec. 31,
2019
Net revenues
$
12,776

 
$
17,367

 
$
26,277

 
$
31,514

 
$
40,206

 
$
67,251

 
$
91,961

 
$
98,479

Cost of goods sold
10,719

 
14,755

 
21,235

 
23,651

 
29,435

 
44,510

 
59,178

 
65,018

Gross profit
2,057

 
2,612

 
5,042

 
7,863

 
10,771

 
22,741

 
32,783

 
33,461

Gross margin
16.1
%
 
15.0
%
 
19.2
%
 
25.0
%
 
26.8
%
 
33.8
%
 
35.6
%
 
34.0
%
Research and development expenses
1,605

 
2,497

 
2,165

 
3,320

 
4,498

 
4,212

 
5,951

 
5,989

Selling, general and administrative expenses
5,737

 
7,043

 
10,353

 
11,328

 
11,177

 
15,515

 
20,944

 
27,090

Restructuring expenses
294

 
348

 
528

 
345

 
394

 
847

 
2,319

 
1,309

Total operating expenses
7,636

 
9,888

 
13,046

 
14,993

 
16,069

 
20,574

 
29,214

 
34,388

(Loss) income from operations
(5,579
)
 
(7,276
)
 
(8,004
)
 
(7,130
)
 
(5,298
)
 
2,167

 
3,569

 
(927
)
Other (expense) income:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Interest expense
(47
)
 
(28
)
 
(313
)
 
(740
)
 
(733
)
 
(741
)
 
(855
)
 
(742
)
Remeasurement of warrant liability
(129
)
 
(130
)
 
(994
)
 
133

 
(759
)
 
(11,744
)
 
—

 
—

Other, net
59

 
38

 
(31
)
 
286

 
141

 
898

 
1,385

 
1,205

Total other (expense) income, net
(117
)
 
(120
)
 
(1,338
)
 
(321
)
 
(1,351
)
 
(11,587
)
 
530

 
463

(Loss) income before taxes
(5,696
)
 
(7,396
)
 
(9,342
)
 
(7,451
)
 
(6,649
)
 
(9,420
)
 
4,099

 
(464
)
Income tax expense (benefit)
—

 
—

 
—

 
1

 
—

 
21

 
—

 
(12
)
Net (loss) income
$
(5,696
)
 
$
(7,396
)
 
$
(9,342
)
 
$
(7,452
)
 
$
(6,649
)
 
$
(9,441
)
 
$
4,099

 
$
(452
)
Net (loss) income per share available to common stockholders:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  Basic
$
(0.98
)
 
$
(1.22
)
 
$
(1.45
)
 
$
(1.10
)
 
$
(0.95
)
 
$
(0.24
)
 
$
0.07

 
$
(0.01
)
  Diluted
$
(0.98
)
 
$
(1.22
)
 
$
(1.45
)
 
$
(1.10
)
 
$
(0.95
)
 
$
(0.24
)
 
$
0.06

 
$
(0.01
)
______________
(1)
The sum of quarterly amounts, including per share amounts, may not equal amounts reported for year-to-date periods. This is due to the effects of rounding and changes in the number of weighted-average shares outstanding for each period.