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Composition of Certain Balance Sheet Items (Tables)
3 Months Ended
Mar. 31, 2016
Composition of Certain Balance Sheet Items [Abstract]  
Schedule of Property and Equipment
Property and Equipment, net
Property and equipment, net consisted of the following (in thousands):
 
 
March 31,
 
December 31,
 
2016
 
2015
Machinery and equipment
$
6,311

 
$
6,210

Leasehold improvements
3,040

 
2,828

Purchased computer software
167

 
167

 
9,518

 
9,205

Less: accumulated depreciation and amortization
(5,594
)
 
(5,343
)
Property and equipment, net
$
3,924

 
$
3,862

Depreciation expense was $0.3 million, and $0.2 million for the three months ended March 31, 2016 and 2015, respectively.
Schedule of Other Current Liabilities
Other Current Liabilities
Other current liabilities consisted of the following (in thousands):
 
 
March 31,
 
December 31,
 
2016
 
2015
Payroll and related expenses
$
2,083

 
$
3,774

Professional services
934

 
325

Deferred rent
304

 
284

Other
516

 
520

Other current liabilities
$
3,837

 
$
4,903