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Balance Sheet Components (Tables)
9 Months Ended
Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Property and Equipment, Net
Property and Equipment, net:
 
September 30, 2019
 
December 31, 2018
 
 (in thousands)
Machinery and equipment
$
4,175

 
$
3,785

Construction in progress
1,297

 
730

Computer and office equipment
561

 
407

Leasehold improvements
497

 
448

Furniture and fixtures
154

 
148

 
6,684

 
5,518

Less: Accumulated depreciation and amortization
(3,659
)
 
(3,364
)
 
$
3,025

 
$
2,154

Schedule of Accrued Liabilities and Other
Accrued Liabilities and Other:
 
September 30, 2019
 
December 31, 2018
 
 (in thousands)
Accrued compensation and related expenses
$
6,097

 
$
5,425

Accrued litigation expense
2,500

 

Accrued professional services
730

 
583

Sales tax payable
346

 
388

Liability for early exercise of unvested stock options
133

 
331

Others
405

 
133

 
$
10,211

 
$
6,860