Accounts Receivable, Net (Tables)

12 Months Ended

Dec. 31, 2015

The following table presents the detail of accounts receivable as of the dates presented (in thousands):


	December 31,
	2015			2014
Accounts receivable	$	30,740		$	17,373
Unbilled accounts receivable		2,427			4,122
Less: allowance for doubtful accounts		(3,378	)		(2,811	)

Accounts receivable, net	$	29,789		$	18,684

The following table presents the changes in the allowance for doubtful accounts for the periods presented (in thousands):


	Year Ended December 31,
	2015			2014			2013
Allowance for doubtful accounts:
Balance, beginning of period	$	2,811		$	1,850		$	965
Additions charged to expense		3,235			2,529			1,907
Less: write-offs, net of recoveries and other adjustments		(2,668	)		(1,568	)		(1,022	)

Balance, end of period	$	3,378		$	2,811		$	1,850