Unaudited Quarterly Financial Information (Tables)

12 Months Ended

Dec. 31, 2013

Quarterly Financial Information Disclosure [Abstract]

Unaudited quarterly results of operations

	Quarter Ended
	March 31				June 30			September 30			December 31
	(in thousands except per share data)
Year Ended December 31, 2013
Operating:
Total revenue	$	47,748			$	55,610		$	51,197		$	38,979
Gross profit	18,230				21,576			21,113			14,374
Net income (loss)	(278		)	(a)	3,405		(b)	6,027		(c)	(2,814		)	(d)
Basic and diluted net income (loss) per share	$	(0.01	)		$	0.12		$	0.21		$	(0.10	)
	Quarter Ended
	March 31				June 30			September 30			December 31
	(in thousands except per share data)
Year Ended December 31, 2012
Operating:
Total revenue	$	35,804			$	36,238		$	42,713		$	44,503
Gross profit	15,157				14,524			18,142			17,229
Net income (loss)	(952		)	(e)	31		(f)	5,228		(g)	2,867			(h)
Basic and diluted net income (loss) per share	$	(0.03	)		$	—		$	0.18		$	0.10

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(a) Includes a non-cash expense for stock-based compensation of $1.0 million.

(b) Includes a non-cash expense for stock-based compensation of $946,000.

(c) Includes a non-cash expense for stock-based compensation of $719,000.

(d) Includes a non-cash expense for stock-based compensation of $1.4 million.

(e) Includes a non-cash expense for stock-based compensation of $1.3 million.

(f) Includes a non-cash expense for stock-based compensation of $770,000.

(g) Includes a non-cash expense for stock-based compensation of $505,000.

(h) Includes a non-cash expense for stock-based compensation of $527,000.