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Balance Sheet Components
9 Months Ended
Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Balance Sheet Components
Balance Sheet Components
Property and Equipment, net (in thousands):
 
September 30,
 
December 31,
 
2018
 
2017
 
 
 
 
Machinery and equipment
$
3,670

 
$
3,428

Construction in progress
660

 
879

Computer and office equipment
325

 
310

Leasehold improvements
443

 
272

Furniture and fixtures
146

 
29

 
5,244

 
4,918

Less: Accumulated depreciation and amortization
(3,196
)
 
(3,022
)
 
$
2,048

 
$
1,896


Depreciation expense were $0.2 million and $0.5 million for the three and nine months ended September 30, 2018, respectively, and $0.3 million and $0.8 million for the three and nine months ended September 30, 2017, respectively.
Accrued Liabilities and Other (in thousands):
 
September 30,
 
December 31,
 
2018
 
2017
 
 
 
 
Accrued compensation, travel and related expenses
$
3,968

 
$
3,732

Accrued interest
1,176

 
831

Accrued professional services
858

 
341

Sales tax payable
461

 
466

Liability for early exercise of unvested stock options
359

 
65

Sales and warranty reserves
52

 
149

Others
278

 
140

 
$
7,152

 
$
5,724