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Balance Sheet Components
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Balance Sheet Components Balance Sheet Components
Inventories
(in thousands)
December 31,
 
March 31,
 
2018
 
2019
Raw materials
$
1,054

 
$
2,147

Finished products
4,690

 
5,909

 
$
5,744

 
$
8,056


As of December 31, 2018 and March 31, 2019, there were no work-in-process inventories.
 Balance Sheet Components
Inventories
(in thousands)
December 31,
 
2017
 
2018
Raw materials
$
506

 
$
1,054

Finished products
2,742

 
4,690

 
$
3,248

 
$
5,744


As of December 31, 2017 and 2018, there were no work-in-process inventories.
Property and Equipment, Net
(in thousands)
December 31,
 
2017
 
2018
Furniture and fixtures
$
76

 
$
517

Equipment
1,059

 
1,217

Software
405

 
76

Leasehold improvements
189

 
1,978

 
1,729

 
3,788

Less: Accumulated depreciation and amortization
(1,303
)
 
(946
)
Add: Construction-in-progress
60

 
38

 
$
486

 
$
2,880


Depreciation and amortization expense was $129,000 and $517,000 for the years ended December 31, 2017 and 2018, respectively.
Accrued Liabilities
(in thousands)
December 31,
 
2017
 
2018
Accrued payroll and related expenses
$
2,718

 
$
5,157

Accrued professional services
64

 
1,014

Accrued royalty expense
—

 
313

Accrued travel expenses
68

 
270

Accrued clinical expenses
183

 
244

Accrued other expenses
76

 
588

 
$
3,109

 
$
7,586