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Composition of Certain Balance Sheet Items
 6 Months Ended
Jun. 30, 2014
Composition of Certain Balance Sheet Items [Abstract]  
Composition of Certain Balance Sheet Items
Composition of Certain Balance Sheet Items
Property and Equipment, net
Property and equipment, net consisted of the following (in thousands):
 
 
June 30,
2014
 
December 31,
2013
Machinery and equipment
$
5,735

 
$
5,649

Leasehold improvements
2,131

 
1,927

Purchased computer software
120

 
85

 
7,986

 
7,661

Less: accumulated depreciation and amortization
(4,646
)
 
(4,289
)
Property and equipment, net
$
3,340

 
$
3,372


Depreciation and amortization expense was $0.2 million and $0.4 million for the three and six months ended June 30, 2014 compared to $0.2 million and $0.3 million for the three and six months ended June 30, 2013, respectively.
Other Current Liabilities
Other current liabilities consisted of the following (in thousands):
 
 
June 30,
2014
 
December 31,
2013
Payroll and related expenses
$
1,787

 
$
2,800

Professional services
1,043

 
616

Accrued offering costs
274

 
82

Deferred rent
138

 
138

Other
450

 
254

Other current liabilities
$
3,692

 
$
3,890